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San Mateo
Illustrated Checklist
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Native and Naturalized (463)
Exotic: Provisional (2)
Exotic: Escapee (25)
Hybrids (24)
- Snow x Ross's Goose (hybrid) Anser caerulescens x rossiiLast observed by Leslie Flint on 5 Jan 2018
- Blue-winged Teal x Northern Shoveler (hybrid) Spatula discors x clypeataLast observed by Emilie Strauss on 16 Dec 2023
- Northern Shoveler x Gadwall (hybrid) Spatula clypeata x Mareca streperaLast observed by Laurie Graham on 22 Nov 2009
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Jake Ruygt on 15 Mar 2024
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Sequoia Audubon Data on 19 Feb 2012
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by sonny mencher on 22 Oct 2013
- Mallard x Mexican Duck (hybrid) Anas platyrhynchos x diaziLast observed by George Chrisman on 14 Jan 2022
- Tufted Duck x Lesser Scaup (hybrid) Aythya fuligula x affinisLast observed by Juli Chamberlin on 17 Dec 2016
- Tufted Duck x scaup sp. (hybrid) Aythya fuligula x marila/affinisLast observed by Ethan Monk on 11 Apr 2020
- Bufflehead x Common Goldeneye (hybrid) Bucephala albeola x clangulaLast observed by Adam Dudley on 15 Dec 2014
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by George Chrisman on 20 Dec 2008
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Van Pierszalowski on 30 Dec 2023
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by Alvaro Jaramillo on 15 Apr 2024
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by Noah Arthur on 7 Apr 2024
- Glaucous x Glaucous-winged Gull (hybrid) Larus hyperboreus x glaucescensLast observed by Noah Arthur on 19 Mar 2022
- Red-tailed x Rough-legged Hawk (hybrid) Buteo jamaicensis x lagopusLast observed by John Davis on 31 Dec 2020
- Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruberLast observed by Malini Kaushik on 3 Feb 2024
- Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus varius/nuchalis x ruberLast observed by Joshua Stacy on 31 Oct 2023
- Barn x Cliff Swallow (hybrid) Hirundo rustica x Petrochelidon pyrrhonotaLast observed by Peter Metropulos on 21 Feb 1992
- White-crowned x Golden-crowned Sparrow (hybrid) Zonotrichia leucophrys x atricapillaLast observed by Tom Johnson on 12 Nov 2021
- Townsend's x Hermit Warbler (hybrid) Setophaga townsendi x occidentalisLast observed by Sequoia Audubon Data on 13 Oct 1977
- Rose-breasted x Black-headed Grosbeak (hybrid) Pheucticus ludovicianus x melanocephalusLast observed by Alane Gray on 28 Jun 2023
- Lazuli x Indigo Bunting (hybrid) Passerina amoena x cyaneaLast observed by Sequoia Audubon Data on 28 Jun 1986
Additional Taxa (146)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Marty Freeland on 14 May 2022
- Western/Clark's Grebe Aechmophorus occidentalis/clarkiiLast observed by Marshall Dinowitz on 18 Apr 2024
- Eurasian/African Collared-Dove Streptopelia decaocto/roseogriseaLast observed by Kent Forward on 4 Apr 2019
- Eastern/Mexican Whip-poor-will Antrostomus vociferus/arizonaeLast observed by Ethan Monk on 30 Nov 2020
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by Courtney Kelly Jett on 3 Apr 2019
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Chris Overington on 23 Apr 2024
- Red/Red-necked Phalarope Phalaropus fulicarius/lobatusLast observed by Terri Williams on 25 Nov 2023
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Terri Williams on 23 Apr 2024
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Chris Ortega on 28 Mar 2024
- Long-tailed/Parasitic Jaeger Stercorarius longicaudus/parasiticusLast observed by Alvaro Jaramillo on 2 Oct 2021
- Parasitic/Pomarine Jaeger Stercorarius parasiticus/pomarinusLast observed by Eli Gross on 28 Oct 2023
- Scripps's/Guadalupe Murrelet (Xantus's Murrelet) Synthliboramphus scrippsi/hypoleucusLast observed by Nick Bonomo on 7 Oct 2023
- Scripps's/Craveri's Murrelet Synthliboramphus scrippsi/craveriLast observed by Alvaro Jaramillo on 26 Jul 2015
- Scripps's/Guadalupe/Craveri's Murrelet Synthliboramphus scrippsi/hypoleucus/craveriLast observed by francesca pastine on 19 Aug 2023
- Herring/Lesser Black-backed Gull Larus argentatus/fuscusLast observed by Noah Arthur on 28 Mar 2023
- Western/Glaucous-winged Gull Larus occidentalis/glaucescensLast observed by Kaia Colestock on 8 Feb 2023
- storm-petrel sp. (dark-rumped) Oceanitidae/Hydrobatidae sp. (dark-rumped)Last observed by Tom Johnson on 26 Apr 2022
- storm-petrel sp. (white-rumped) Oceanitidae/Hydrobatidae sp. (white-rumped)Last observed by Alex Merritt on 2 Sep 2012
- Sooty/Short-tailed Shearwater Ardenna grisea/tenuirostrisLast observed by Cédric Duhalde on 6 Nov 2023
- black-and-white shearwater sp. Puffinus sp. (black-and-white shearwater sp.)Last observed by Alvaro Jaramillo on 31 Jul 2021
- shearwater sp. Procellariidae sp. (shearwater sp.)Last observed by Krzysztof Kurylowicz on 28 Jan 2024
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Marty Freeland on 14 Oct 2023
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Kent Forward on 6 Nov 2022
- Yellow-bellied/Red-naped Sapsucker Sphyrapicus varius/nuchalisLast observed by Garrett Lau on 13 Nov 2023
- Red-naped/Red-breasted Sapsucker Sphyrapicus nuchalis/ruberLast observed by Keith Gress on 27 Jan 2020
- Mitred/Red-masked Parakeet Psittacara mitratus/erythrogenysLast observed by Jennifer Rycenga on 6 Oct 2021
- large parakeet sp. (former Aratinga sp.) Eupsittula/Aratinga/Thectocercus/Psittacara sp.Last observed by ryan doherty on 15 Aug 2012
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Alvaro Jaramillo on 25 Aug 2018
- yellow-bellied kingbird sp. Tyrannus sp. (yellow-bellied)Last observed by Dominik Mosur on 23 Mar 2022
- Tree/Violet-green Swallow Tachycineta bicolor/thalassinaLast observed by Richard Jeffers on 8 Apr 2024
- House/Purple Finch Haemorhous mexicanus/purpureusLast observed by Gray Gallogly Records on 27 Apr 2003
- Bullock's/Baltimore Oriole Icterus bullockii/galbulaLast observed by Alvaro Jaramillo on 6 Nov 2021
- Red-winged/Tricolored Blackbird Agelaius phoeniceus/tricolorLast observed by Michael Long on 3 Nov 2023
- Black-throated Gray/Hermit Warbler Setophaga nigrescens/occidentalisLast observed by Jane Tatchell on 18 May 2014
- Townsend's/Hermit Warbler Setophaga townsendi/occidentalisLast observed by Alex Rinkert on 21 Aug 2023
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Chris Hayward on 5 Oct 2023