species
32.
species
33.
species
48.
species
52.
species
53.
species
57.
species
59.
species
105.
species
123.
species
124.
species
128.
species
141.
species
156.
species
161.
species
172.
species
182.
species
184.
species
189.
species
193.
species
199.
species
234.
species
235.
species
245.
species
253.
species
267.
species
279.
species
296.
species
301.
species
306.
species
317.
species
319.
species
345.
species
353.
species
365.
species
369.
species
378.
species
382.
species
384.
species
397.
species
403.
species
407.
species
417.
species
419.
species
422.
species
424.
species
425.
species
428.
species
434.
species
443.
species
451.
species
452.
species
469.
species
475.
species
481.
species
487.
species
498.
species
507.
species
509.
species
512.
species
514.
species
515.
species
522.
species
523.
species
525.
species
527.
species
536.
species
542.
species
552.
species
554.
species
555.
species
556.
species
557.
species
559.
species
565.
species
566.
species
568.
species
569.
species
572.
species
574.
species
575.
species
579.
species
583.
species
584.
species
585.
species
586.
species
587.
species
590.
species
593.
species
595.
species
596.
species
598.
species
599.
species
601.
species
602.
species
604.
species
607.
species
608.
species
610.
species
611.
species
614.
species
615.
species
616.
species
617.
species
618.
species
620.
species
621.
species
622.
species
623.
species
626.
species
628.
species
629.
species
631.
species
633.
species
636.
species
637.
species
638.
species
639.
species
640.
species
642.
species
643.
species
645.
species
648.
species
649.
species
650.
species
651.
species
652.
species
653.
species
654.
species
655.
species
656.
species
658.
species
659.
species
660.
species
661.
species
662.
species
663.
species
664.
species
665.
species
666.
species
667.
species
669.
species
670.
species
672.
species
674.
species
675.
species
676.
species
677.
species
678.
species
679.
species
680.
species
681.
species
682.
species
683.
species
684.
species
685.
species
688.
species
689.
species
690.
species
691.
species
692.
species
693.
species
694.
species
695.
species
696.
species
697.
species
698.
species
699.
species
700.
species
701.
species
702.
species
703.
species
704.
species
706.
species
707.
species
708.
species
709.
species
710.
species
711.
species
712.
species
713.
species
714.
species
715.
species
716.
species
717.
species
718.
species
719.
species
720.
species
721.
species
722.
species
723.
species
724.
species
725.
species
726.
species
729.
species
730.
species
731.
species
733.
species
734.
species
735.
species
736.
species
737.
species
738.
species
739.
species
740.
species
741.
species
742.
species
743.
species
744.
species
745.
species
746.
species
747.
species
748.
species
749.
species
750.
species
751.
species
752.
species
753.
species
754.
species
755.
species
756.
species
757.
species
758.
species
759.
species
760.
species
761.
species
762.
species
763.
species
764.
species
765.
species
766.
species
769.
species
770.
species
773.
species
774.
species
775.
species
776.
species
777.
species
779.
species
780.
species
781.
species
782.
species
783.
species
784.
species
785.
species
786.
species
787.
species
789.
species
790.
species
791.
species
792.
species
793.
species
794.
species
795.
species
796.
species
798.
species
799.
species
800.
species
801.
species
802.
species
803.
species
804.
species
805.
species
806.
species
807.
species
808.
species
809.
species
810.
species
811.
species
812.
species
813.
species
814.
species
815.
species
816.
species
817.
species
818.
species
819.
species
821.
species
822.
species
823.
species
824.
species
825.
species
826.
species
827.
species
828.
species
829.
species
830.
species
831.
species
832.
species
833.
species
834.
species
836.
species
837.
species
838.
species
839.
species
840.
species
841.
species
842.
species
843.
species
844.
species
845.
species
846.
species
847.
species
848.
species
849.
species
851.
species
852.
species
853.
species
854.
species
855.
species
856.
species
857.
species
858.
species
859.
species
861.
species
862.
species
863.
species
864.
species
865.
species
866.
species
867.
species
868.
species
869.
species
870.
species
872.
species
873.
species
874.
species
875.
species
876.
species
877.
species
878.
species
879.
species
880.
species
881.
species
882.
species
883.
species
884.
species
885.
species
886.
species
887.
species
888.
species
889.
species
890.
species
891.
species
892.
species
893.
species
894.
species
895.
species
896.
species
897.
species
898.
species
899.
species
900.
species
901.
species
902.
species
903.
species
904.
species
905.
species
906.
species
907.
species
908.
species
909.
species
910.
species
911.
species
912.
species
913.
species
914.
species
915.
species
916.
species
917.
species
918.
species
919.
species
920.
species
921.
species
922.
species
923.
species
924.
species
925.
species
926.
species
927.
species
928.
species
929.
species
930.
species
931.
species
932.
species
933.
species
934.
species
935.
species
936.
species
937.
species
938.
species
939.
species
940.
species
941.
species
942.
species
943.
species
944.
species
945.
species
946.
species
947.
species
948.
species
949.
species
950.
species
951.
species
952.
species
953.
species
954.
species
955.
species
956.
species
957.
species
958.
species
959.
species
960.
species
961.
species
962.
species
963.
species
964.
species
965.
species
966.
species
967.
species
968.
species
969.
species
970.
species
971.
species
972.
species
973.
species
974.
species
975.
species
976.
species
977.
species
978.
species
979.
species
980.
species
981.
species
982.
species
983.
species
984.
species
985.
species
986.
species
987.
species
988.
species
989.
species
990.
species
991.
species
992.
species
993.
species
994.
species
995.
species
996.
species
997.
species
998.
species
999.
species
1000.
species
1001.
species
1002.
species
1003.
species
1004.
species
1005.
species
1006.
species
1007.
species
1008.
species
1009.
species
1010.
species
1011.
species
1012.
species
1013.
species
1014.
species
1015.
species
1016.
species
1017.
species
1018.
species
1019.
species
1020.
species
1021.
species
1022.
species
1023.
species
1024.
species
1025.
species
1026.
species
1027.
species
1028.
species
1029.
species
1030.
species
1031.
species
1032.
species
1033.
species
1035.
species
1037.
species
1038.
species
1039.
species
1040.
species
1041.
species
1042.
species
1043.
species
1045.
species
1046.
species
1049.
species
1050.
species
1051.
species
1053.
species
1054.
species
1055.
species
1056.
species
1057.
species
1058.
species
1059.
species
1060.
species
1061.
species
1062.
species
1063.
species
1064.
species
1065.
species
1066.
species
1067.
species
1068.
species
1069.
species
1070.
species
1071.
species
1072.
species
1073.
species
1075.
species
1076.
species
1077.
species
1078.
species
1079.
species
1080.
species
1081.
species
1082.
species
1083.
species
1084.
species
1086.
species
1088.
species
1089.
species
1090.
species
1092.
species
1093.
species
1094.
species
1095.
species
1096.
species
1097.
species
1099.
species
1100.
species
1101.
species
1102.
species
1103.
species
1104.
species
1105.
species
1106.
species
1107.
species
1108.
species
1109.
species
1110.
species
1111.
species
1125.
species
1127.
species
1128.
species
1129.
species
1130.
species
1134.
species
1136.
species
1138.
species
1139.
species
1140.
species
1141.
species
1142.
species
1143.
species
1144.
species
1145.
species
1147.
species
1148.
species
1149.
species
1150.
species
1151.
Snow x Ross's Goose (hybrid)
Anser caerulescens x rossii
Mallard x Mexican Duck (hybrid)
Anas platyrhynchos x diazi
Tufted x Black-crested Titmouse (hybrid)
Baeolophus bicolor x atricristatus
Mallard x Mottled Duck (hybrid)
Anas platyrhynchos x fulvigula
Western x Glaucous-winged Gull (hybrid)
Larus occidentalis x glaucescens
Muscovy Duck x Mallard (hybrid)
Cairina moschata x Anas platyrhynchos
Mallard x American Black Duck (hybrid)
Anas platyrhynchos x rubripes
Mallard x Hawaiian Duck (hybrid)
Anas platyrhynchos x wyvilliana
Carolina x Black-capped Chickadee (hybrid)
Poecile carolinensis x atricapillus
Red-naped x Red-breasted Sapsucker (hybrid)
Sphyrapicus nuchalis x ruber
American Wigeon x Green-winged Teal (hybrid)
Mareca americana x Anas crecca
Yellow-bellied x Red-naped Sapsucker (hybrid)
Sphyrapicus varius x nuchalis
Domestic goose sp. x Canada Goose (hybrid)
Anser sp. (Domestic type) x Branta canadensis
Herring x Glaucous-winged Gull (hybrid)
Larus argentatus x glaucescens
Mallard x Northern Pintail (hybrid)
Anas platyrhynchos x acuta
Snow Goose x Brant (hybrid)
Anser caerulescens x Branta bernicla
Northern Shoveler x Mallard (hybrid)
Spatula clypeata x Anas platyrhynchos
Swan Goose x Canada Goose (hybrid)
Anser cygnoides x Branta canadensis
Graylag x Canada Goose (hybrid)
Anser anser x Branta canadensis
Snow x Canada Goose (hybrid)
Anser caerulescens x Branta canadensis
Cinnamon x Green-winged Teal (hybrid)
Spatula cyanoptera x Anas crecca
Magnolia x Yellow-rumped Warbler (hybrid)
Setophaga magnolia x coronata
Bufflehead x Common Goldeneye (hybrid)
Bucephala albeola x clangula
Mexican x Mottled Duck (hybrid)
Anas diazi x fulvigula
Downy x Hairy Woodpecker (hybrid)
Dryobates pubescens x villosus
Tufted Duck x Greater Scaup (hybrid)
Aythya fuligula x marila
Blue-winged x Cinnamon Teal (hybrid)
Spatula discors x cyanoptera
Canvasback x Redhead (hybrid)
Aythya valisineria x americana
Common x Barrow's Goldeneye (hybrid)
Bucephala clangula x islandica
Gadwall x Mallard (hybrid)
Mareca strepera x Anas platyrhynchos
American x Black Oystercatcher (hybrid)
Haematopus palliatus x bachmani
Glaucous x Glaucous-winged Gull (hybrid)
Larus hyperboreus x glaucescens
Red-tailed x Ferruginous Hawk (hybrid)
Buteo jamaicensis x regalis
American Wigeon x Mallard (hybrid)
Mareca americana x Anas platyrhynchos
Eurasian x American Wigeon (hybrid)
Mareca penelope x americana
Glossy x White-faced Ibis (hybrid)
Plegadis falcinellus x chihi
Cinnamon Teal x Northern Shoveler (hybrid)
Spatula cyanoptera x clypeata
Greater White-fronted x Canada Goose (hybrid)
Anser albifrons x Branta canadensis
Snow x Cackling Goose (hybrid)
Anser caerulescens x Branta hutchinsii
Black-capped x Mountain Chickadee (hybrid)
Poecile atricapillus x gambeli
Ring-necked Duck x scaup sp. (hybrid)
Aythya collaris x marila/affinis
Altamira x Audubon's Oriole (hybrid)
Icterus gularis x graduacauda
Herring x Lesser Black-backed Gull (hybrid)
Larus argentatus x fuscus
Anna's x Broad-billed Hummingbird (hybrid)
Calypte anna x Cynanthus latirostris
Blue-winged Teal x Northern Shoveler (hybrid)
Spatula discors x clypeata
Red-tailed x Rough-legged Hawk (hybrid)
Buteo jamaicensis x lagopus
Spotted x Eastern Towhee (hybrid)
Pipilo maculatus x erythrophthalmus
Snow x Greater White-fronted Goose (hybrid)
Anser caerulescens x albifrons
Townsend's x Hermit Warbler (hybrid)
Setophaga townsendi x occidentalis
Redhead x Ring-necked Duck (hybrid)
Aythya americana x collaris
White-crowned x Golden-crowned Sparrow (hybrid)
Zonotrichia leucophrys x atricapilla
Common Black x Red-shouldered Hawk (hybrid)
Buteogallus anthracinus x Buteo lineatus
Herring x Glaucous Gull (hybrid)
Larus argentatus x hyperboreus
Tufted Duck x scaup sp. (hybrid)
Aythya fuligula x marila/affinis
Snow/Ross's x Cackling/Canada Goose (hybrid)
Anser caerulescens/rossii x Branta hutchinsii/canadensis
Ross's x Cackling Goose (hybrid)
Anser rossii x Branta hutchinsii
Greater White-fronted x Cackling Goose (hybrid)
Anser albifrons x Branta hutchinsii
Western x Clark's Grebe (hybrid)
Aechmophorus occidentalis x clarkii
Nuttall's x Ladder-backed Woodpecker (hybrid)
Dryobates nuttallii x scalaris
Northern Cardinal x Pyrrhuloxia (hybrid)
Cardinalis cardinalis x sinuatus
Northern Shoveler x Gadwall (hybrid)
Spatula clypeata x Mareca strepera
Herring x Great Black-backed Gull (hybrid)
Larus argentatus x marinus
Northern x Tropical Parula (hybrid)
Setophaga americana x pitiayumi
Downy x Nuttall's Woodpecker (hybrid)
Dryobates pubescens x nuttallii
Common Goldeneye x Hooded Merganser (hybrid)
Bucephala clangula x Lophodytes cucullatus
Bufflehead x goldeneye sp. (hybrid)
Bucephala albeola x clangula/islandica
Ross's x Canada Goose (hybrid)
Anser rossii x Branta canadensis
Red-crowned x Lilac-crowned Parrot (hybrid)
Amazona viridigenalis x finschi
Scaled x Gambel's Quail (hybrid)
Callipepla squamata x gambelii
Wood Duck x Mallard (hybrid)
Aix sponsa x Anas platyrhynchos
Red-shouldered x Red-tailed Hawk (hybrid)
Buteo lineatus x jamaicensis
Canvasback x Ring-necked Duck (hybrid)
Aythya valisineria x collaris
Dark-eyed Junco x White-throated Sparrow (hybrid)
Junco hyemalis x Zonotrichia albicollis
Redhead x scaup sp. (hybrid)
Aythya americana x marila/affinis
Ring-necked Duck x Lesser Scaup (hybrid)
Aythya collaris x affinis
Blue-winged x Green-winged Teal (hybrid)
Spatula discors x Anas crecca
Hooded x Common Merganser (hybrid)
Lophodytes cucullatus x Mergus merganser
House x Eurasian Tree Sparrow (hybrid)
Passer domesticus x montanus
California x Gambel's Quail (hybrid)
Callipepla californica x gambelii
Barnacle x Canada Goose (hybrid)
Branta leucopsis x canadensis
White-crowned x White-throated Sparrow (hybrid)
Zonotrichia leucophrys x albicollis
Canyon x Abert's Towhee (hybrid)
Melozone fusca x aberti
Barnacle x Cackling Goose (hybrid)
Branta leucopsis x hutchinsii
Golden-fronted x Red-bellied Woodpecker (hybrid)
Melanerpes aurifrons x carolinus
Yellow-rumped x Townsend's Warbler (hybrid)
Setophaga coronata x townsendi
Ring-necked Duck x Greater Scaup (hybrid)
Aythya collaris x marila
Greater White-fronted x Cackling/Canada Goose (hybrid)
Anser albifrons x Branta hutchinsii/canadensis
Anna's x Costa's Hummingbird (hybrid)
Calypte anna x costae
Mallard x Green-winged Teal (hybrid)
Anas platyrhynchos x crecca
White x Salmon-crested Cockatoo (hybrid)
Cacatua alba x moluccensis
Tufted Duck x Lesser Scaup (hybrid)
Aythya fuligula x affinis
Red-whiskered x Red-vented Bulbul (hybrid)
Pycnonotus jocosus x cafer
Red-crowned x Red-lored Parrot (hybrid)
Amazona viridigenalis x autumnalis
goldeneye sp. x Hooded Merganser (hybrid)
Bucephala clangula/islandica x Lophodytes cucullatus
Black-headed x Ring-billed Gull (hybrid)
Chroicocephalus ridibundus x Larus delawarensis
Fischer's x Yellow-collared Lovebird (hybrid)
Agapornis fischeri x personatus
Gray-crowned x Black Rosy-Finch (hybrid)
Leucosticte tephrocotis x atrata
Gadwall x American Wigeon (hybrid)
Mareca strepera x americana
Northern Pintail x Green-winged Teal (hybrid)
Anas acuta x crecca
Mute x Trumpeter Swan (hybrid)
Cygnus olor x buccinator
Canyon x Spotted Towhee (hybrid)
Melozone fusca x Pipilo maculatus
Mountain x Mexican Chickadee (hybrid)
Poecile gambeli x sclateri
Golden-crowned x White-throated Sparrow (hybrid)
Zonotrichia atricapilla x albicollis
Bufflehead x Hooded Merganser (hybrid)
Bucephala albeola x Lophodytes cucullatus
Steller's x Blue Jay (hybrid)
Cyanocitta stelleri x cristata
Northern x Gilded Flicker (hybrid)
Colaptes auratus x chrysoides
Laughing x Ring-billed Gull (hybrid)
Leucophaeus atricilla x Larus delawarensis
Eurasian Collared-Dove x Mourning Dove (hybrid)
Streptopelia decaocto x Zenaida macroura
Kelp x Herring Gull (hybrid)
Larus dominicanus x argentatus
Eurasian x African Collared-Dove (hybrid)
Streptopelia decaocto x roseogrisea
American Wigeon x Northern Pintail (hybrid)
Mareca americana x Anas acuta
Double-crested x Neotropic Cormorant (hybrid)
Nannopterum auritum x brasilianum
Lazuli x Indigo Bunting (hybrid)
Passerina amoena x cyanea
Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid)
Sphyrapicus varius/nuchalis x ruber
Bullock's x Baltimore Oriole (hybrid)
Icterus bullockii x galbula
Anna's x Allen's Hummingbird (hybrid)
Calypte anna x Selasphorus sasin
Black-throated Gray x Townsend's Warbler (hybrid)
Setophaga nigrescens x townsendi
Mallard x Pacific Black Duck (hybrid)
Anas platyrhynchos x superciliosa
Yellow-rumped x Hermit Warbler (hybrid)
Setophaga coronata x occidentalis
Gadwall x Northern Pintail (hybrid)
Mareca strepera x Anas acuta
Golden-winged x Blue-winged Warbler (hybrid)
Vermivora chrysoptera x cyanoptera
Brewster's Warbler (hybrid)
Vermivora chrysoptera x cyanoptera (F1 hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
Setophaga townsendi x virens
Herring x Slaty-backed Gull (hybrid)
Larus argentatus x schistisagus
Lawrence's Warbler (hybrid)
Vermivora chrysoptera x cyanoptera (F2 backcross)
Ruby-throated x Black-chinned Hummingbird (hybrid)
Archilochus colubris x alexandri
Black x Eastern Phoebe (hybrid)
Sayornis nigricans x phoebe
Broad-billed x Violet-crowned Hummingbird (hybrid)
Cynanthus latirostris x Ramosomyia violiceps
Western x Flame-colored Tanager (hybrid)
Piranga ludoviciana x bidentata
Glaucous-winged x Slaty-backed Gull (hybrid)
Larus glaucescens x schistisagus
Lucifer x Black-chinned Hummingbird (hybrid)
Calothorax lucifer x Archilochus alexandri
Black-chinned x Broad-tailed Hummingbird (hybrid)
Archilochus alexandri x Selasphorus platycercus
Black-chinned x Anna's Hummingbird (hybrid)
Archilochus alexandri x Calypte anna
Rose-breasted x Black-headed Grosbeak (hybrid)
Pheucticus ludovicianus x melanocephalus
Bahama x Northern Mockingbird (hybrid)
Mimus gundlachii x polyglottos
Calliope x Rufous Hummingbird (hybrid)
Selasphorus calliope x rufus
Sandwich x Elegant Tern (hybrid)
Thalasseus sandvicensis x elegans
Barn x Cliff Swallow (hybrid)
Hirundo rustica x Petrochelidon pyrrhonota
Black-chinned x Calliope Hummingbird (hybrid)
Archilochus alexandri x Selasphorus calliope
Little Blue Heron x Snowy Egret (hybrid)
Egretta caerulea x thula
Herring x California Gull (hybrid)
Larus argentatus x californicus
Yellow-bellied x Red-breasted Sapsucker (hybrid)
Sphyrapicus varius x ruber
Barn x Cave Swallow (hybrid)
Hirundo rustica x Petrochelidon fulva
Black-chinned x Broad-billed Hummingbird (hybrid)
Archilochus alexandri x Cynanthus latirostris
Rufous x Allen's Hummingbird (hybrid)
Selasphorus rufus x sasin
Great Egret x Great Blue Heron (hybrid)
Ardea alba x herodias
Colima x Virginia's Warbler (hybrid)
Leiothlypis crissalis x virginiae
Common x Arctic Tern (hybrid)
Sterna hirundo x paradisaea
Northern Parula x Black-throated Gray Warbler (hybrid)
Setophaga americana x nigrescens
Western x Chihuahuan Meadowlark (hybrid)
Sturnella neglecta x lilianae
Bay-breasted x Blackpoll Warbler (hybrid)
Setophaga castanea x striata
King x Clapper Rail (hybrid)
Rallus elegans x crepitans
Western x Eastern Kingbird (hybrid)
Tyrannus verticalis x tyrannus
Pine Siskin x American Goldfinch (hybrid)
Spinus pinus x tristis
Spotted x Barred Owl (hybrid)
Strix occidentalis x varia
Western Kingbird x Scissor-tailed Flycatcher (hybrid)
Tyrannus verticalis x forficatus
Downy x Ladder-backed Woodpecker (hybrid)
Dryobates pubescens x scalaris
Snowy x Little Egret (hybrid)
Egretta thula x garzetta
Yellow-rumped x Grace's Warbler (hybrid)
Setophaga coronata x graciae
White-crowned x Harris's Sparrow (hybrid)
Zonotrichia leucophrys x querula
Black-capped x White-eyed Vireo (hybrid)
Vireo atricapilla x griseus
Northern Parula x Yellow-throated Warbler (hybrid)
Setophaga americana x dominica
Sharp-tailed Grouse x Greater Prairie-Chicken (hybrid)
Tympanuchus phasianellus x cupido
Greater x Lesser Prairie-Chicken (hybrid)
Tympanuchus cupido x pallidicinctus
Cape May x Magnolia Warbler (hybrid)
Setophaga tigrina x magnolia
Redhead x Lesser Scaup (hybrid)
Aythya americana x affinis
Black-throated Gray x Hermit Warbler (hybrid)
Setophaga nigrescens x occidentalis
Steller's Jay x Woodhouse's Scrub-Jay (hybrid)
Cyanocitta stelleri x Aphelocoma woodhouseii
MacGillivray's Warbler x Common Yellowthroat (hybrid)
Geothlypis tolmiei x trichas
Ladder-backed x Hairy Woodpecker (hybrid)
Dryobates scalaris x villosus
Mallard x Mexican/Mottled Duck (hybrid)
Anas platyrhynchos x diazi/fulvigula
Barrow's Goldeneye x Hooded Merganser (hybrid)
Bucephala islandica x Lophodytes cucullatus
Trumpeter x Tundra Swan (hybrid)
Cygnus buccinator x columbianus
Common x Great-tailed Grackle (hybrid)
Quiscalus quiscula x mexicanus
Mute x Whooper Swan (hybrid)
Cygnus olor x cygnus
Trumpeter x Whooper Swan (hybrid)
Cygnus buccinator x cygnus
Dark-eyed Junco x White-crowned Sparrow (hybrid)
Junco hyemalis x Zonotrichia leucophrys
Western x Mountain Bluebird (hybrid)
Sialia mexicana x currucoides
Black-bellied x Fulvous Whistling-Duck (hybrid)
Dendrocygna autumnalis x bicolor
Boat-tailed x Great-tailed Grackle (hybrid)
Quiscalus major x mexicanus
Mallard x Ring-necked Duck (hybrid)
Anas platyrhynchos x Aythya collaris
Hairy x White-headed Woodpecker (hybrid)
Dryobates villosus x albolarvatus
Black-chinned x Costa's Hummingbird (hybrid)
Archilochus alexandri x Calypte costae
White x Scarlet Ibis (hybrid)
Eudocimus albus x ruber
Couch's Kingbird x Scissor-tailed Flycatcher (hybrid)
Tyrannus couchii x forficatus
Golden x Lady Amherst's Pheasant (hybrid)
Chrysolophus pictus x amherstiae
Summer x Western Tanager (hybrid)
Piranga rubra x ludoviciana
Nelson's x Saltmarsh Sparrow (hybrid)
Ammospiza nelsoni x caudacuta
Yellow-throated x Blue-headed Vireo (hybrid)
Vireo flavifrons x solitarius
Tropical x Gray Kingbird (hybrid)
Tyrannus melancholicus x dominicensis
Graylag x Swan Goose (hybrid)
Anser anser x cygnoides
Tricolored Heron x Snowy Egret (hybrid)
Egretta tricolor x thula
Brown x Blue-footed Booby (hybrid)
Sula leucogaster x nebouxii
Anna's x Rufous Hummingbird (hybrid)
Calypte anna x Selasphorus rufus
Yellow-breasted Chat x new world oriole sp. (hybrid)
Icteria virens x Icterus sp.
Buff-breasted x White-rumped Sandpiper (hybrid)
Calidris subruficollis x fuscicollis
Dark-eyed x Yellow-eyed Junco (hybrid)
Junco hyemalis x phaeonotus
Lucifer x Costa's Hummingbird (hybrid)
Calothorax lucifer x Calypte costae
Dunlin x White-rumped Sandpiper (hybrid)
Calidris alpina x fuscicollis
Blue-winged Teal x American Wigeon (hybrid)
Spatula discors x Mareca americana
Cerulean Warbler x Northern Parula (hybrid)
Setophaga cerulea x americana
Varied x Painted Bunting (hybrid)
Passerina versicolor x ciris
Eastern x Mountain Bluebird (hybrid)
Sialia sialis x currucoides
California x Crissal Thrasher (hybrid)
Toxostoma redivivum x crissale
Anna's Hummingbird x Selasphorus sp. (hybrid)
Calypte anna x Selasphorus sp.
Grasshopper x Savannah Sparrow (hybrid)
Ammodramus savannarum x Passerculus sandwichensis
Ross's x Greater White-fronted Goose (hybrid)
Anser rossii x albifrons
House x Purple Finch (hybrid)
Haemorhous mexicanus x purpureus
Little Blue x Tricolored Heron (hybrid)
Egretta caerulea x tricolor
Curve-billed x Long-billed Thrasher (hybrid)
Toxostoma curvirostre x longirostre
Gadwall x Green-winged Teal (hybrid)
Mareca strepera x Anas crecca
Indigo x Painted Bunting (hybrid)
Passerina cyanea x ciris
Mountain x Chestnut-backed Chickadee (hybrid)
Poecile gambeli x rufescens
Blue-and-yellow x Scarlet Macaw (hybrid)
Ara ararauna x macao
Northern Shoveler x American Wigeon (hybrid)
Spatula clypeata x Mareca americana
Sandhill x Common Crane (hybrid)
Antigone canadensis x Grus grus
Rivoli's x Berylline Hummingbird (hybrid)
Eugenes fulgens x Saucerottia beryllina
Great Black-backed x Glaucous Gull (hybrid)
Larus marinus x hyperboreus
Common Gallinule x American Coot (hybrid)
Gallinula galeata x Fulica americana
Ruddy x Common Shelduck (hybrid)
Tadorna ferruginea x tadorna
Clay-colored x Field Sparrow (hybrid)
Spizella pallida x pusilla
Kentucky Warbler x Common Yellowthroat (hybrid)
Geothlypis formosa x trichas
Green-tailed x Spotted Towhee (hybrid)
Pipilo chlorurus x maculatus
Northern Bobwhite x California Quail (hybrid)
Colinus virginianus x Callipepla californica
Glaucous x Slaty-backed Gull (hybrid)
Larus hyperboreus x schistisagus
American Redstart x Northern Parula (hybrid)
Setophaga ruticilla x americana
Yellow-crowned x Black-crowned Night Heron (hybrid)
Nyctanassa violacea x Nycticorax nycticorax
MacGillivray's x Mourning Warbler (hybrid)
Geothlypis tolmiei x philadelphia
Mourning Warbler x Common Yellowthroat (hybrid)
Geothlypis philadelphia x trichas
Yellow x Prairie Warbler (hybrid)
Setophaga petechia x discolor
Black-chinned x Rufous Hummingbird (hybrid)
Archilochus alexandri x Selasphorus rufus
Laysan x Black-footed Albatross (hybrid)
Phoebastria immutabilis x nigripes
Western x Eastern Meadowlark (hybrid)
Sturnella neglecta x magna
Redhead x Greater Scaup (hybrid)
Aythya americana x marila
Greater Sage-Grouse x Sharp-tailed Grouse (hybrid)
Centrocercus urophasianus x Tympanuchus phasianellus
Anna's x Calliope Hummingbird (hybrid)
Calypte anna x Selasphorus calliope
Mallard x Eastern Spot-billed Duck (hybrid)
Anas platyrhynchos x zonorhyncha
Canvasback x scaup sp. (hybrid)
Aythya valisineria x marila/affinis
Eurasian Wigeon x Northern Pintail (hybrid)
Mareca penelope x Anas acuta
Emperor x Greater White-fronted Goose (hybrid)
Anser canagicus x albifrons
Red-shouldered x Broad-winged Hawk (hybrid)
Buteo lineatus x platypterus
Yellow x Black-throated Blue Warbler (hybrid)
Setophaga petechia x caerulescens
Chipping x Field Sparrow (hybrid)
Spizella passerina x pusilla
American Redstart x Yellow Warbler (hybrid)
Setophaga ruticilla x petechia
Palm x Yellow-rumped Warbler (hybrid)
Setophaga palmarum x coronata
Costa's x Broad-billed Hummingbird (hybrid)
Calypte costae x Cynanthus latirostris
Western x Eastern Wood-Pewee (hybrid)
Contopus sordidulus x virens
Crimson x Eastern Rosella (hybrid)
Platycercus elegans x eximius
House x Fish Crow (hybrid)
Corvus splendens x ossifragus
Rufous x Broad-tailed Hummingbird (hybrid)
Selasphorus rufus x platycercus
Scarlet Tanager x Rose-breasted Grosbeak (hybrid)
Piranga olivacea x Pheucticus ludovicianus
Summer x Scarlet Tanager (hybrid)
Piranga rubra x olivacea
Magnolia x Palm Warbler (hybrid)
Setophaga magnolia x palmarum
Emperor x Cackling Goose (hybrid)
Anser canagicus x Branta hutchinsii
King x Common Eider (hybrid)
Somateria spectabilis x mollissima
Lesser x American Goldfinch (hybrid)
Spinus psaltria x tristis
Cape May x Yellow-rumped Warbler (hybrid)
Setophaga tigrina x coronata
Chipping x Clay-colored Sparrow (hybrid)
Spizella passerina x pallida
Chestnut-sided x Black-throated Blue Warbler (hybrid)
Setophaga pensylvanica x caerulescens
American Wigeon x American Black Duck (hybrid)
Mareca americana x Anas rubripes
Ring-necked x Tufted Duck (hybrid)
Aythya collaris x fuligula
Northern Bobwhite x Scaled Quail (hybrid)
Colinus virginianus x Callipepla squamata
Spectacled x King Eider (hybrid)
Somateria fischeri x spectabilis
Snow x McKay's Bunting (hybrid)
Plectrophenax nivalis x hyperboreus
Cliff x Cave Swallow (hybrid)
Petrochelidon pyrrhonota x fulva
Yellow-rumped x Yellow-throated Warbler (hybrid)
Setophaga coronata x dominica
Western x Eastern Screech-Owl (hybrid)
Megascops kennicottii x asio
Common x Hoary Redpoll (hybrid)
Acanthis flammea x hornemanni
Hooded x Yellow Warbler (hybrid)
Setophaga citrina x petechia
Yellow-rumped x Black-throated Gray Warbler (hybrid)
Setophaga coronata x nigrescens
Peregrine x Prairie Falcon (hybrid)
Falco peregrinus x mexicanus
Mallard x Redhead (hybrid)
Anas platyrhynchos x Aythya americana
Surf x White-winged Scoter (hybrid)
Melanitta perspicillata x deglandi
Painted x Slate-throated Redstart (hybrid)
Myioborus pictus x miniatus
Calliope x Broad-tailed Hummingbird (hybrid)
Selasphorus calliope x platycercus
Warbling x Red-eyed Vireo (hybrid)
Vireo gilvus x olivaceus
White-winged x Yellow-chevroned Parakeet (hybrid)
Brotogeris versicolurus x chiriri
Couch's x Western Kingbird (hybrid)
Tyrannus couchii x verticalis
Sandhill x Whooping Crane (hybrid)
Antigone canadensis x Grus americana
Clay-colored x Brewer's Sparrow (hybrid)
Spizella pallida x breweri
Tropical x Northern Mockingbird (hybrid)
Mimus gilvus x polyglottos
Ruby-throated x Broad-tailed Hummingbird (hybrid)
Archilochus colubris x Selasphorus platycercus
Blue-winged x Prairie Warbler (hybrid)
Vermivora cyanoptera x Setophaga discolor
Brant x Cackling Goose (hybrid)
Branta bernicla x hutchinsii
Wood Duck x Hooded Merganser (hybrid)
Aix sponsa x Lophodytes cucullatus
Common Yellowthroat x Rufous-capped Warbler (hybrid)
Geothlypis trichas x Basileuterus rufifrons
Dusky x Sharp-tailed Grouse (hybrid)
Dendragapus obscurus x Tympanuchus phasianellus
Red Crossbill x Pine Siskin (hybrid)
Loxia curvirostra x Spinus pinus
Great Knot x Surfbird (hybrid)
Calidris tenuirostris x virgata
Violet-green x Northern Rough-winged Swallow (hybrid)
Tachycineta thalassina x Stelgidopteryx serripennis
Thick-billed x Common Murre (hybrid)
Uria lomvia x aalge
Lucifer x Anna's Hummingbird (hybrid)
Calothorax lucifer x Calypte anna
Tree x Violet-green Swallow (hybrid)
Tachycineta bicolor x thalassina
Violet-green x Cliff Swallow (hybrid)
Tachycineta thalassina x Petrochelidon pyrrhonota
Black x Say's Phoebe (hybrid)
Sayornis nigricans x saya
Philadelphia x Red-eyed Vireo (hybrid)
Vireo philadelphicus x olivaceus
Veery x Bicknell's Thrush (hybrid)
Catharus fuscescens x bicknelli
Common x Roseate Tern (hybrid)
Sterna hirundo x dougallii
Song x Swamp Sparrow (hybrid)
Melospiza melodia x georgiana
Grace's x Black-throated Gray Warbler (hybrid)
Setophaga graciae x nigrescens
Common Yellowthroat x Yellow Warbler (hybrid)
Geothlypis trichas x Setophaga petechia
Gray-crowned x Common Yellowthroat (hybrid)
Geothlypis poliocephala x trichas
Hepatic x Flame-colored Tanager (hybrid)
Piranga flava x bidentata
Swainson's x Rough-legged Hawk (hybrid)
Buteo swainsoni x lagopus
Herring x Iceland Gull (hybrid)
Larus argentatus x glaucoides
Brewer's Blackbird x Great-tailed Grackle (hybrid)
Euphagus cyanocephalus x Quiscalus mexicanus
Black-tailed x Black-capped Gnatcatcher (hybrid)
Polioptila melanura x nigriceps
Mountain x Boreal Chickadee (hybrid)
Poecile gambeli x hudsonicus
Tree x Barn Swallow (hybrid)
Tachycineta bicolor x Hirundo rustica
Nuttall's x Hairy Woodpecker (hybrid)
Dryobates nuttallii x villosus
Curlew x Pectoral Sandpiper (hybrid)
Calidris ferruginea x melanotos
passerine sp.
Passeriformes sp.
duck sp.
Anatidae (duck sp.)
new world sparrow sp.
Passerellidae sp.
woodpecker sp.
Picidae sp.
Glossy/White-faced Ibis
Plegadis falcinellus/chihi
swallow sp.
Hirundinidae sp.
Downy/Hairy Woodpecker
Dryobates pubescens/villosus
House/Purple Finch
Haemorhous mexicanus/purpureus
blackbird sp.
Icteridae sp.
Domestic goose sp. (Domestic type)
Anser sp. (Domestic type)
American/Fish Crow
Corvus brachyrhynchos/ossifragus
Yellow-crowned/Black-crowned Night Heron
Nycticorax nycticorax/Nyctanassa violacea
new world vulture sp.
Cathartidae sp.
Greater/Lesser Scaup
Aythya marila/affinis
pigeon/dove sp.
Columbidae sp.
Trumpeter/Tundra Swan
Cygnus buccinator/columbianus
Carolina/Black-capped Chickadee
Poecile carolinensis/atricapillus
Tree/Violet-green Swallow
Tachycineta bicolor/thalassina
cormorant sp.
Phalacrocoracidae sp.
hawk sp.
Accipitridae sp. (hawk sp.)
Western/Eastern Meadowlark
Sturnella neglecta/magna
Black-capped/Mountain Chickadee
Poecile atricapillus/gambeli
Sharp-shinned/Cooper's Hawk
Accipiter striatus/cooperii
Northern/Gilded Flicker
Colaptes auratus/chrysoides
Cackling/Canada Goose
Branta hutchinsii/canadensis
Double-crested/Neotropic Cormorant
Nannopterum auritum/brasilianum
peep sp.
Calidris sp. (peep sp.)
Mallard/Mottled Duck
Anas platyrhynchos/fulvigula
Western/Clark's Grebe
Aechmophorus occidentalis/clarkii
large shorebird sp.
Scolopacidae sp. (large shorebird sp.)
crow sp.
Corvus sp. (crow sp.)
Anna's/Costa's Hummingbird
Calypte anna/costae
Common/Red-breasted Merganser
Mergus merganser/serrator
shorebird sp.
Charadriiformes sp.
Western/Glaucous-winged Gull
Larus occidentalis/glaucescens
new world warbler sp.
Parulidae sp.
Snow/Ross's Goose
Anser caerulescens/rossii
dabbling duck sp.
Anatidae sp. (dabbling duck sp.)
Louisiana/Northern Waterthrush
Parkesia motacilla/noveboracensis
swan sp.
Cygnus sp.
hummingbird sp.
Trochilidae sp.
Ruby-crowned/Golden-crowned Kinglet
Corthylio calendula/Regulus satrapa
Western/Chihuahuan Meadowlark
Sturnella neglecta/lilianae
Rufous/Allen's Hummingbird
Selasphorus rufus/sasin
Lesser/Greater Yellowlegs
Tringa flavipes/melanoleuca
new world oriole sp.
Icterus sp.
Accipiter sp.
Accipiter sp.
raven sp.
Corvus sp. (raven sp.)
Tufted/Black-crested Titmouse
Baeolophus bicolor/atricristatus
rail/crake sp.
Rallidae sp. (rail/crake sp.)
Elegant/Royal Tern
Thalasseus elegans/maximus
crow/raven sp.
Corvus sp.
diurnal raptor sp.
Accipitriformes/Falconiformes sp.
teal sp.
Anatidae sp. (teal sp.)
chickadee sp.
Poecile sp.
eagle sp.
Accipitridae sp. (eagle sp.)
Short-billed/Long-billed Dowitcher
Limnodromus griseus/scolopaceus
Red-shouldered/Broad-winged Hawk
Buteo lineatus/platypterus
Great/Double-crested Cormorant
Phalacrocorax carbo/Nannopterum auritum
small falcon sp.
Falco sp. (small falcon sp.)
grebe sp.
Podicipedidae sp.
murrelet sp.
Brachyramphus/Synthliboramphus sp.
Horned/Eared Grebe
Podiceps auritus/nigricollis
Cliff/Cave Swallow
Petrochelidon pyrrhonota/fulva
Empidonax sp.
Empidonax sp.
finch sp.
Fringillidae sp.
Calidris sp.
Calidris sp.
Mallard/American Black Duck
Anas platyrhynchos/rubripes
Cassin's/Western Kingbird
Tyrannus vociferans/verticalis
merganser sp.
Mergellus/Lophodytes/Mergus sp.
Surf/Black Scoter
Melanitta perspicillata/americana
tern sp.
Sterninae sp.
Loggerhead/Northern Shrike
Lanius ludovicianus/borealis
Boat-tailed/Great-tailed Grackle
Quiscalus major/mexicanus
white egret sp.
Egretta/Bubulcus/Ardea sp.
Tropical/Couch's Kingbird
Tyrannus melancholicus/couchii
goose sp.
Anatidae (goose sp.)
Ruby-throated/Black-chinned Hummingbird
Archilochus colubris/alexandri
Blue-winged/Cinnamon Teal
Spatula discors/cyanoptera
Canyon/Abert's Towhee
Melozone fusca/aberti
Mallard/Mexican Duck
Anas platyrhynchos/diazi
rosy-finch sp.
Leucosticte sp.
Western/Semipalmated Sandpiper
Calidris mauri/pusilla
Common/Hoary Redpoll
Acanthis flammea/hornemanni
Common/Barrow's Goldeneye
Bucephala clangula/islandica
Brown/Long-billed Thrasher
Toxostoma rufum/longirostre
sapsucker sp.
Sphyrapicus sp.
Setophaga sp.
Setophaga sp.
wren sp.
Troglodytidae sp.
Red-winged/Tricolored Blackbird
Agelaius phoeniceus/tricolor
Zonotrichia sp.
Zonotrichia sp.
gull/tern sp.
Laridae sp.
Bronzed/Brown-headed Cowbird
Molothrus aeneus/ater
Mitred/Red-masked Parakeet
Psittacara mitratus/erythrogenys
parrot sp.
Psittaciformes sp. (parrot sp.)
waterfowl sp.
Anatidae sp.
White-crowned/White-throated Sparrow
Zonotrichia leucophrys/albicollis
Mexican/Mottled Duck
Anas diazi/fulvigula
shrike sp.
Lanius sp.
grackle sp.
Quiscalus sp.
scoter sp.
Melanitta sp.
Downy/Ladder-backed Woodpecker
Dryobates pubescens/scalaris
large alcid sp.
Alca/Uria sp.
large falcon sp.
Falco sp. (large falcon sp.)
gnatcatcher sp.
Polioptila sp.
Amazona sp.
Amazona sp.
Bullock's/Baltimore Oriole
Icterus bullockii/galbula
Nuttall's/Ladder-backed Woodpecker
Dryobates nuttallii/scalaris
new world goldfinch sp.
Spinus sp. (goldfinch sp.)
Sagebrush/Bell's Sparrow (Sage Sparrow)
Artemisiospiza nevadensis/belli
California/Gambel's Quail
Callipepla californica/gambelii
Ammospiza sp.
Ammospiza sp.
Northern Cardinal/Pyrrhuloxia
Cardinalis cardinalis/sinuatus
Melanerpes sp.
Melanerpes sp.
Purple/Cassin's Finch
Haemorhous purpureus/cassinii
Dark-eyed/Yellow-eyed Junco
Junco hyemalis/phaeonotus
white-winged gull sp.
Larus sp. (white-winged gull sp.)
yellow-bellied kingbird sp.
Tyrannus sp. (yellow-bellied)
Herring/Glaucous-winged Gull
Larus argentatus/glaucescens
Common/Yellow-billed Loon
Gavia immer/adamsii
parakeet sp.
Psittaciformes sp. (parakeet sp.)
Eurasian/American Wigeon
Mareca penelope/americana
Forster's/Common Tern
Sterna forsteri/hirundo
Toxostoma sp.
Toxostoma sp.
Catharus sp.
Catharus sp.
Rusty/Brewer's Blackbird
Euphagus carolinus/cyanocephalus
Cassin's/Plumbeous Vireo
Vireo cassinii/plumbeus
grouse sp.
Tetraoninae sp.
Golden/Bald Eagle
Aquila chrysaetos/Haliaeetus leucocephalus
longspur sp.
Calcarius/Rhynchophanes sp.
Red-crowned/Lilac-crowned Parrot
Amazona viridigenalis/finschi
new world flycatcher sp.
Tyrannidae sp.
Spizella sp./American Tree Sparrow
Spizella/Spizelloides sp.
Spotted/Eastern Towhee (Rufous-sided Towhee)
Pipilo maculatus/erythrophthalmus
King/Virginia Rail
Rallus elegans/limicola
Northern/Tropical Parula
Setophaga americana/pitiayumi
Gray/Dusky Flycatcher
Empidonax wrightii/oberholseri
Long-eared/Short-eared Owl
Asio otus/flammeus
Parasitic/Pomarine Jaeger
Stercorarius parasiticus/pomarinus
large tern sp.
Hydroprogne/Thalasseus sp.
King/Clapper Rail
Rallus elegans/crepitans
corvid sp.
Corvidae sp.
Bohemian/Cedar Waxwing
Bombycilla garrulus/cedrorum
Dryobates sp.
Dryobates sp.
jay sp.
Corvidae sp. (jay sp.)
Mallard/Hawaiian Duck
Anas platyrhynchos/wyvilliana
alcid sp.
Alcidae sp.
Black-bellied Plover/golden-plover sp.
Pluvialis sp.
American Black/Mottled Duck
Anas rubripes/fulvigula
Thick-billed/Common Murre
Uria lomvia/aalge
Lazuli/Indigo Bunting
Passerina amoena/cyanea
Psittacara sp.
Psittacara sp.
whistling-duck sp.
Dendrocygna sp.
Eurasian Moorhen/Common Gallinule
Gallinula chloropus/galeata
Spizella sp.
Spizella sp.
shearwater sp.
Procellariidae sp. (shearwater sp.)
new world quail sp.
Odontophoridae sp.
Red/Red-necked Phalarope
Phalaropus fulicarius/lobatus
Sooty/Short-tailed Shearwater
Ardenna grisea/tenuirostris
Curve-billed/Bendire's Thrasher
Toxostoma curvirostre/bendirei
corella/white cockatoo sp.
Cacatua sp.
Acanthis/Spinus sp.
Acanthis/Spinus sp.
tanager sp. (Piranga sp.)
Piranga sp.
hawaiian honeycreeper sp.
Drepanidinae sp.
ground dove/Inca Dove
Columbina sp.
Varied Thrush/American Robin
Ixoreus naevius/Turdus migratorius
Lincoln's/Swamp Sparrow
Melospiza lincolnii/georgiana
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Ammospiza nelsoni/caudacuta
Red-naped/Red-breasted Sapsucker
Sphyrapicus nuchalis/ruber
Passerina sp.
Passerina sp.
nighthawk sp.
Chordeiles sp.
Golden-fronted/Red-bellied Woodpecker
Melanerpes aurifrons/carolinus
Sturnella meadowlark sp.
Sturnella sp.
estrildid finch sp.
Estrildidae sp.
storm-petrel sp.
Oceanitidae/Hydrobatidae sp.
small plover sp.
Charadrius/Anarhynchus sp.
Spinus sp.
Spinus sp.
Rock/Band-tailed Pigeon
Columba livia/Patagioenas fasciata
sparrow/warbler sp. (trilling song)
Passerellidae/Parulidae sp. (trilling song)
solitary vireo sp.
Vireo cassinii/solitarius/plumbeus
Myiarchus sp.
Myiarchus sp.
jaeger sp.
Stercorarius sp. (jaeger sp.)
Oak/Juniper Titmouse (Plain Titmouse)
Baeolophus inornatus/ridgwayi
Herring/Iceland Gull
Larus argentatus/glaucoides
plover sp.
Charadriidae sp.
Haemorhous sp.
Haemorhous sp.
American/Black Oystercatcher
Haematopus palliatus/bachmani
ibis sp.
Threskiornithidae sp. (ibis sp.)
phoebe sp.
Sayornis sp.
Selasphorus sp.
Selasphorus sp.
Western/Eastern Cattle Egret
Bubulcus ibis/coromandus
tropicbird sp.
Phaethon sp.
Eurasian/African Collared-Dove
Streptopelia decaocto/roseogrisea
Chaetura sp.
Chaetura sp.
black-and-white shearwater sp.
Puffinus sp. (black-and-white shearwater sp.)
Yellow-bellied/Red-naped Sapsucker
Sphyrapicus varius/nuchalis
francolin/spurfowl sp.
Phasianidae sp. (francolin/spurfowl sp.)
Tringa sp.
Tringa sp.
auklet sp.
Ptychoramphus/Aethia sp.
Streptopelia sp.
Streptopelia sp.
California/Woodhouse's Scrub-Jay
Aphelocoma californica/woodhouseii
Orchard/Hooded Oriole
Icterus spurius/cucullatus
Domestic lovebird sp. (Domestic type)
Agapornis sp. (Domestic type)
Red-whiskered/Red-vented Bulbul
Pycnonotus jocosus/cafer
large parakeet sp. (former Aratinga sp.)
Eupsittula/Aratinga/Thectocercus/Psittacara sp.
albatross sp.
Diomedeidae sp.
crane sp.
Gruidae sp.
King/Common Eider
Somateria spectabilis/mollissima
House/Eurasian Tree Sparrow
Passer domesticus/montanus
Asio sp.
Asio sp.
procellariid sp.
Procellariidae sp.
Hammond's/Dusky Flycatcher
Empidonax hammondii/oberholseri
curlew sp.
Numenius sp.
Ruffed/Spruce Grouse
Bonasa umbellus/Canachites canadensis
Grasshopper/Baird's Sparrow
Ammodramus savannarum/Centronyx bairdii
White-winged/Yellow-chevroned Parakeet
Brotogeris versicolurus/chiriri
Townsend's/Hermit Warbler
Setophaga townsendi/occidentalis
Chimney/Vaux's Swift
Chaetura pelagica/vauxi
Bridled/Juniper Titmouse
Baeolophus wollweberi/ridgwayi
Brown/Black Noddy
Anous stolidus/minutus
towhee sp.
Melozone/Pipilo sp.
jaeger/skua sp.
Stercorarius sp.
ptarmigan sp.
Lagopus sp.
Buteo/eagle sp.
Buteo/eagle sp.
Pacific/Winter Wren
Troglodytes pacificus/hiemalis
Aphelocoma sp.
Aphelocoma sp.
Ring-necked/Green Pheasant
Phasianus colchicus/versicolor
moorhen/coot/gallinule sp.
Gallinula/Fulica/Porphyrio sp.
Tyrannus sp.
Tyrannus sp.
large rail sp.
Rallus sp. (large Rallus sp.)
pelican sp.
Pelecanus sp.
kingfisher sp.
Alcedinidae sp.
Cooper's Hawk/American Goshawk
Accipiter cooperii/atricapillus
storm-petrel sp. (white-rumped)
Oceanitidae/Hydrobatidae sp. (white-rumped)
Black/Pigeon Guillemot
Cepphus grylle/columba
Gray-tailed/Wandering Tattler
Tringa brevipes/incana
storm-petrel sp. (dark-rumped)
Oceanitidae/Hydrobatidae sp. (dark-rumped)
Cassin's/Blue-headed Vireo
Vireo cassinii/solitarius
Masked/Ruddy Duck
Nomonyx dominicus/Oxyura jamaicensis
Lonchura sp.
Lonchura sp.
oystercatcher sp.
Haematopus sp.
Rose-breasted/Black-headed Grosbeak
Pheucticus ludovicianus/melanocephalus
phalarope sp.
Phalaropus sp.
Herring/Lesser Black-backed Gull
Larus argentatus/fuscus
Common/Ruddy Ground Dove
Columbina passerina/talpacoti
Sooty/Bridled Tern
Onychoprion fuscatus/anaethetus
Yellow-footed/Western Gull
Larus livens/occidentalis
Arctic/Pacific Loon
Gavia arctica/pacifica
Boreal/Northern Saw-whet Owl
Aegolius funereus/acadicus
pheasant sp.
Phasianidae sp. (pheasant sp.)
frigatebird sp.
Fregata sp.
Common/Short-billed Gull
Larus canus/brachyrhynchus
Podiceps sp.
Podiceps sp.
Leach's/Townsend's/Ainley's Storm-Petrel
Hydrobates leucorhous/socorroensis/cheimomnestes
American Three-toed/Black-backed Woodpecker
Picoides dorsalis/arcticus
Caprimulgus sp.
Caprimulgus sp.
Summer/Scarlet Tanager
Piranga rubra/olivacea
American/Greater Flamingo
Phoenicopterus ruber/roseus
Passer sp.
Passer sp.
Sedge/Marsh Wren
Cistothorus stellaris/palustris
Common/Wilson's Snipe
Gallinago gallinago/delicata
Pterodroma sp.
Pterodroma sp.
Scripps's/Craveri's Murrelet
Synthliboramphus scrippsi/craveri
Tachycineta sp.
Tachycineta sp.
golden-plover sp.
Pluvialis dominica/apricaria/fulva
Botteri's/Cassin's Sparrow
Peucaea botterii/cassinii
large swift sp.
Apodidae sp. (large swift sp.)
lark sp.
Alaudidae sp.
Greater/Lesser Prairie-Chicken
Tympanuchus cupido/pallidicinctus
Scripps's/Guadalupe Murrelet (Xantus's Murrelet)
Synthliboramphus scrippsi/hypoleucus
American/Pacific Golden-Plover (Lesser Golden-Plover)
Pluvialis dominica/fulva
Masked/Nazca Booby
Sula dactylatra/granti
Scripps's/Guadalupe/Craveri's Murrelet
Synthliboramphus scrippsi/hypoleucus/craveri
new world martin sp. (Progne sp.)
Progne sp.
Laughing/Franklin's Gull
Leucophaeus atricilla/pipixcan
Red/Cassia Crossbill
Loxia curvirostra/sinesciuris
Thraupidae sp.
Thraupidae sp.
Dusky/Sooty Grouse
Dendragapus obscurus/fuliginosus
Scolopacidae sp.
Scolopacidae sp.
Turdus sp.
Turdus sp.
Common/Arctic Tern
Sterna hirundo/paradisaea
Bay-breasted/Blackpoll Warbler
Setophaga castanea/striata
Snow/McKay's Bunting
Plectrophenax nivalis/hyperboreus
Cory's/Great Shearwater
Calonectris diomedea/Ardenna gravis
Strix sp.
Strix sp.
Cookilaria petrel sp.
Pterodroma sp. (Cookilaria sp.)
Long-tailed/Parasitic Jaeger
Stercorarius longicaudus/parasiticus
Western Cattle/Yellow-billed Egret
Bubulcus ibis/Ardea brachyrhyncha
Alder/Willow Flycatcher (Traill's Flycatcher)
Empidonax alnorum/traillii
Western/Eastern Wood-Pewee
Contopus sordidulus/virens
Sharp-tailed/Pectoral Sandpiper
Calidris acuminata/melanotos
Clay-colored/Brewer's Sparrow
Spizella pallida/breweri
Red-eyed/Yellow-green Vireo
Vireo olivaceus/flavoviridis
skua sp.
Stercorarius sp. (skua sp.)
Leiothlypis sp.
Leiothlypis sp.
LeConte's/Nelson's Sparrow
Ammospiza leconteii/nelsoni
Yellow-billed/Black-billed Cuckoo
Coccyzus americanus/erythropthalmus
Common/Spotted Sandpiper
Actitis hypoleucos/macularius
Gray-cheeked/Bicknell's Thrush
Catharus minimus/bicknelli
MacGillivray's/Mourning Warbler
Geothlypis tolmiei/philadelphia
cuckoo sp. (Cuculidae sp.)
Cuculidae sp.
Purple/Rock Sandpiper
Calidris maritima/ptilocnemis
Philadelphia/Warbling Vireo
Vireo philadelphicus/gilvus
Eastern/Chihuahuan Meadowlark
Sturnella magna/lilianae
Golden-winged/Blue-winged Warbler
Vermivora chrysoptera/cyanoptera
Shiny/Brown-headed Cowbird
Molothrus bonariensis/ater
Hydrobates sp.
Hydrobates sp.
Antrostomus sp.
Antrostomus sp.
Coccyzus sp.
Coccyzus sp.
nightjar sp.
Caprimulgidae sp.
Black-legged/Red-legged Kittiwake
Rissa tridactyla/brevirostris
pewee sp. (Contopus sp.)
Contopus sp.
Black-throated Gray/Hermit Warbler
Setophaga nigrescens/occidentalis
Philadelphia/Red-eyed Vireo
Vireo philadelphicus/olivaceus
Pheucticus sp.
Pheucticus sp.
Leach's/Townsend's Storm-Petrel (white-rumped)
Hydrobates leucorhous/socorroensis (white-rumped)
White-winged/Stejneger's Scoter
Melanitta deglandi/stejnegeri
Black-throated Gray/Townsend's Warbler
Setophaga nigrescens/townsendi
Hen/Northern Harrier
Circus cyaneus/hudsonius
Common Ringed/Semipalmated Plover
Charadrius hiaticula/semipalmatus
Petrochelidon sp.
Petrochelidon sp.
Connecticut/MacGillivray's/Mourning Warbler
Oporornis/Geothlypis sp. (Mourning-type)
screech-owl sp.
Megascops sp.
Ardea sp.
Ardea sp.
yellowthroat sp.
Geothlypis sp. (yellowthroat sp.)
Hepatic/Summer Tanager
Piranga flava/rubra
Phylloscopus sp.
Phylloscopus sp.
Leach's/Townsend's Storm-Petrel
Hydrobates leucorhous/socorroensis
flamingo sp.
Phoenicopteridae sp.
Eastern/Mexican Whip-poor-will
Antrostomus vociferus/arizonae
Long-tailed/Pomarine Jaeger
Stercorarius longicaudus/pomarinus
Smooth-billed/Groove-billed Ani
Crotophaga ani/sulcirostris
puffin sp.
Fratercula sp.
Hudsonian/Marbled Godwit
Limosa haemastica/fedoa
small swift sp.
Apodidae sp. (small swift sp.)
Red-necked/Little Stint
Calidris ruficollis/minuta
vireo sp. (Red-eyed Vireo complex)
Vireo sp. (Red-eyed Vireo complex)
sand-plover sp.
Anarhynchus atrifrons/mongolus/leschenaultii
Leach's/Townsend's Storm-Petrel (dark-rumped)
Hydrobates leucorhous/socorroensis (dark-rumped)
Psittacula sp.
Psittacula sp.
Spotted/Barred Owl
Strix occidentalis/varia
pygmy-owl/saw-whet owl sp.
Glaucidium/Aegolius sp. (pygmy-owl/saw-whet owl sp.)
Cuculus sp.
Cuculus sp.
Pycnonotus sp.
Pycnonotus sp.
Cory's/Cape Verde Shearwater
Calonectris diomedea/edwardsii
Thalasseus sp.
Thalasseus sp.
Chipping Sparrow/Worm-eating Warbler
Spizella passerina/Helmitheros vermivorum
Common/Antillean Nighthawk
Chordeiles minor/gundlachii
Common/Oriental Cuckoo
Cuculus canorus/optatus
Taiga/Tundra Bean-Goose
Anser fabalis/serrirostris
quail-dove sp.
Geotrygon/Leptotrygon/Zentrygon sp.
Emberiza sp.
Emberiza sp.
old world quail sp.
Synoicus/Coturnix sp.
tanager sp. (Thraupidae sp.)
Thraupidae sp. (tanager sp.)
Red-eyed/Black-whiskered Vireo
Vireo olivaceus/altiloquus
Dark-eyed Junco/Pine Warbler
Junco hyemalis/Setophaga pinus
Brotogeris sp.
Brotogeris sp.
harrier sp.
Circus sp.
Common/Black Scoter
Melanitta nigra/americana
parid sp.
Paridae sp.
Oriental/Eurasian Magpie
Pica serica/pica
Anser sp.
Anser sp.
eclectus sp.
Eclectus sp.
whydah sp.
Vidua sp. (whydah sp.)
wagtail sp.
Motacilla sp.
Grasshopper/Henslow's Sparrow
Ammodramus savannarum/Centronyx henslowii
Little/Least Tern
Sternula albifrons/antillarum
lapwing sp.
Vanellus sp.
Scarlet-fronted/Cordilleran Parakeet
Psittacara wagleri/frontatus
Red-eyed/Chivi Vireo
Vireo olivaceus/chivi
Bullock's/Black-backed Oriole
Icterus bullockii/abeillei
old world warbler sp.
Passeriformes sp. (Old World warbler sp.)
Tundra/Whooper Swan
Cygnus columbianus/cygnus
Cathartes sp.
Cathartes sp.
Ridgway's/Mangrove/Clapper Rail
Rallus obsoletus/longirostris/crepitans
stilt/avocet sp.
Recurvirostridae sp.
lovebird sp.
Agapornis sp.
Shiny/Bronzed Cowbird
Molothrus bonariensis/aeneus
Columba sp.
Columba sp.
Red-billed/Red-tailed Tropicbird
Phaethon aethereus/rubricauda
Zosterops sp.
Zosterops sp.
large macaw sp.
Ara sp.
House/Italian Sparrow
Passer domesticus/italiae
Greater/Lesser White-fronted Goose
Anser albifrons/erythropus
swamphen sp.
Porphyrio sp. (swamphen sp.)
Patagioenas sp.
Patagioenas sp.
Red-legged/Rock Partridge
Alectoris rufa/graeca
Aquila sp.
Aquila sp.
Black-throated Gray/Townsend's/Hermit Warbler
Setophaga nigrescens/townsendi/occidentalis
Hydrobates sp. (Band-rumped complex)
Hydrobates sp. (Band-rumped complex)
elaenia sp. (genus Elaenia)
Elaenia sp.
myna/starling sp.
Sturnidae sp.
Vidua sp.
Vidua sp.
Lesser/Greater Roadrunner
Geococcyx velox/californianus
Yellow-legged/Lesser Black-backed Gull
Larus michahellis/fuscus
Ploceus sp.
Ploceus sp.
coot sp.
Fulica sp.
Japanese Leaf/Arctic/Kamchatka Leaf Warbler
Phylloscopus xanthodryas/borealis/examinandus
Bank Swallow/Pale Martin
Riparia riparia/diluta
Arctic/Kamchatka Leaf Warbler
Phylloscopus borealis/examinandus
Forpus sp.
Forpus sp.
Gray-streaked/Dark-sided Flycatcher
Muscicapa griseisticta/sibirica
small bittern sp.
Ixobrychus sp.
Black-throated/White-throated Magpie-Jay
Calocitta colliei/formosa
Parus sp.
Parus sp.
Velvet/White-winged/Stejneger's Scoter
Melanitta fusca/deglandi/stejnegeri
Great/Medium Egret
Ardea alba/intermedia
Ash-throated/Nutting's Flycatcher
Myiarchus cinerascens/nuttingi
Bubo sp.
Bubo sp.
white-eye sp.
Zosteropidae sp.
Mississippi/Plumbeous Kite
Ictinia mississippiensis/plumbea
Tropical/Northern Mockingbird
Mimus gilvus/polyglottos
Garganey/Green-winged Teal
Spatula querquedula/Anas crecca
Northern/Great Gray Shrike
Lanius borealis/excubitor
Procellaria sp.
Procellaria sp.
paradise-whydah sp.
Vidua sp. (paradise-whydah sp.)
stork sp.
Ciconiidae sp.
Galapagos/Hawaiian Petrel (Dark-rumped Petrel)
Pterodroma phaeopygia/sandwichensis
Glaucidium sp.
Glaucidium sp.
Myioborus sp.
Myioborus sp.
waxbill sp.
Estrilda sp.
Zino's/Fea's Petrel
Pterodroma madeira/feae
cordonbleu sp.
Uraeginthus sp.
large albatross sp.
Diomedea sp.
Chlidonias sp.
Chlidonias sp.
Serinus sp.
Serinus sp.
Geranoaetus/Buteo sp.
Geranoaetus/Buteo sp.
Euplectes sp.
Euplectes sp.
Cypseloides sp.
Cypseloides sp.
Greater/Gunnison Sage-Grouse
Centrocercus urophasianus/minimus
small albatross sp.
Thalassarche sp.
Sporophila sp.
Sporophila sp.
Pica sp.
Pica sp.
Western/Eastern Yellow Wagtail
Motacilla flava/tschutschensis
Trindade/Herald Petrel
Pterodroma arminjoniana/heraldica
White-capped/Salvin's/Chatham Albatross
Thalassarche cauta/salvini/eremita
Eurasian/Oriental Skylark
Alauda arvensis/gulgula
Morelet's/Cinnamon-rumped Seedeater
Sporophila morelleti/torqueola
Siberian/Amur Stonechat
Saxicola maurus/stejnegeri
Dusky/Naumann's Thrush
Turdus eunomus/naumanni
Streaked/Sulphur-bellied Flycatcher
Myiodynastes maculatus/luteiventris
Snowy/Kentish Plover
Anarhynchus nivosus/alexandrinus
rainbow lorikeet sp.
Trichoglossus sp. (rainbow lorikeet complex)
Tree/Olive-backed Pipit
Anthus trivialis/hodgsoni
large toucan sp.
Ramphastos sp.
Timaliidae sp.
Timaliidae sp.
Snowy/Tristan/Antipodean Albatross
Diomedea exulans/dabbenena/antipodensis
hornbill sp.
Bucerotidae sp.