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Illustrated Checklist

 Powered by Macaulay Library and eBird
Updated ~31 seconds ago

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239 Species Observed
Species w/ Photos
Species w/ Audio
Species Needing Photos
Species Needing Audio
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Native and Naturalized (239)

  1. Last observed by Ron Taylor on 9 Apr 2024
  2. Last observed by Jeff Acuff on 20 Feb 2011
  3. Last observed by Carla Din on 1 Oct 2022
  4. Last observed by Phred Benham on 30 Dec 2023
  5. Last observed by Ron Taylor on 9 Apr 2024
  6. Last observed by Megan Prelinger on 20 Apr 2024
  7. Last observed by Jack Hayden on 11 Oct 2023
  8. Last observed by Phred Benham on 9 May 2020
  9. Last observed by Lee Friedman on 5 Mar 2024
  10. Last observed by Megan Prelinger on 20 Apr 2024
  11. Last observed by Jeff Hoppes on 13 Mar 2024
  12. Last observed by Megan Prelinger on 20 Apr 2024
  13. Last observed by Vicky Atkinson on 13 Apr 2024
  14. Last observed by Eric Cameron on 26 Aug 2023
  15. Last observed by Steve Buffi on 20 Jan 2024
  16. Last observed by Jessica Campbell on 28 Dec 2023
  17. Last observed by Diane Rose on 16 Feb 2014
  18. Last observed by Ryan Watson on 9 Jan 2024
  19. Last observed by Vicky Atkinson on 6 Apr 2024
  20. Last observed by Vicky Atkinson on 13 Apr 2024
  21. Last observed by Jerry Ting on 12 Feb 2011
  22. Last observed by Owen Bowie on 9 Mar 2024
  23. Last observed by Marky Mutchler on 15 Dec 2021
  24. Last observed by Adrianna Tan on 30 Jan 2022
  25. Last observed by Kir Pridatko on 5 Feb 2019
  26. Last observed by Megan Prelinger on 20 Apr 2024
  27. Last observed by Melani King on 21 Mar 2024
  28. Last observed by Ethan Monk on 13 Jan 2019
  29. Last observed by Phred Benham on 26 Dec 2022
  30. Last observed by Becky Matsubara on 16 Feb 2023
  31. Last observed by Anonymous eBirder on 13 Mar 2024
  32. Last observed by Owen Bowie on 9 Mar 2024
  33. Last observed by sonja raub on 27 Aug 2022
  34. Last observed by Megan Prelinger on 20 Apr 2024
  35. Last observed by Barry Parkin on 23 Feb 2015
  36. Last observed by Dean Gregory on 4 Jan 2024
  37. Last observed by Melani King on 21 Mar 2024
  38. Last observed by Jack Hayden on 4 Mar 2024
  39. Last observed by Jeff Hoppes on 13 Mar 2024
  40. Last observed by Megan Prelinger on 20 Apr 2024
  41. Last observed by Megan Prelinger on 20 Apr 2024
  42. Last observed by Megan Prelinger on 20 Apr 2024
  43. Last observed by Ethan Monk on 6 Oct 2023
  44. Last observed by Elizabeth Ferber on 22 Sep 2023
  45. Last observed by Nat Smale on 12 Feb 2024
  46. Last observed by Phred Benham on 9 Oct 2019
  47. Last observed by Derek Heins on 21 Sep 2023
  48. Last observed by Erica Rutherford/ John Colbert on 18 Jan 2024
  49. Last observed by Megan Prelinger on 20 Apr 2024
  50. Last observed by Ethan Monk on 7 Apr 2023
  51. Last observed by Trevor Leitz on 1 Apr 2024
  52. Last observed by Emilie Strauss on 30 Jan 2022
  53. Last observed by Vicky Atkinson on 13 Apr 2024
  54. Last observed by Becky Matsubara on 3 Jan 2021
  55. Last observed by Elizabeth Kroll on 21 Jan 2016
  56. Last observed by Anonymous eBirder on 13 Mar 2024
  57. Last observed by Becky Flanigan on 10 Mar 2024
  58. Last observed by Megan Prelinger on 20 Apr 2024
  59. Last observed by Emilie Strauss on 26 Apr 2023
  60. Last observed by Samantha King on 1 Sep 2023
  61. Last observed by Phred Benham on 1 Oct 2023
  62. Last observed by Eric Cameron on 23 Oct 2022
  63. Last observed by Jerry Ting on 5 Feb 2012
  64. Last observed by Joe Kelly on 12 Sep 2021
  65. Last observed by Ethan Monk on 26 Oct 2021
  66. Last observed by Derek Heins on 27 Sep 2020
  67. Last observed by Samantha King on 1 Sep 2023
  68. Last observed by Megan Prelinger on 20 Apr 2024
  69. Last observed by Phred Benham on 25 Sep 2022
  70. Last observed by Dan Sidle on 25 Aug 2022
  71. Last observed by Rick Prelinger on 4 Feb 2023
  72. Last observed by Nat Weber on 15 Mar 2024
  73. Last observed by Patricia Reese on 23 Apr 2018
  74. Last observed by Ethan Monk on 7 Apr 2023
  75. Last observed by Ethan Monk on 6 Sep 2022
  76. Last observed by Ethan Monk on 22 Apr 2023
  77. Last observed by Phred Benham on 30 Dec 2023
  78. Last observed by Chris Wills on 31 Aug 2022
  79. Last observed by Megan Prelinger on 20 Apr 2024
  80. Last observed by Sadie Cosby on 23 Dec 2023
  81. Last observed by Ethan Monk on 22 Oct 2022
  82. Last observed by Zac Denning on 5 Aug 2023
  83. Last observed by Nat Weber on 25 Jan 2024
  84. Last observed by Owen Bowie on 9 Mar 2024
  85. Last observed by Contra Costa County Historical Record on 9 Jan 1977
  86. Last observed by Phred Benham on 1 Oct 2023
  87. Last observed by Jack Hayden on 3 Mar 2024
  88. Last observed by Vicky Atkinson on 13 Apr 2024
  89. Last observed by Megan Prelinger on 20 Apr 2024
  90. Last observed by terence zahner on 18 Feb 2024
  91. Last observed by logan kahle on 8 Feb 2015
  92. Last observed by Megan Prelinger on 20 Apr 2024
  93. Last observed by Owen Bowie on 9 Mar 2024
  94. Last observed by Albert Linkowski on 20 Jan 2016
  95. Last observed by Owen Bowie on 9 Mar 2024
  96. Last observed by Christina Tarr on 9 Mar 2023
  97. Last observed by Megan Prelinger on 20 Apr 2024
  98. Last observed by Megan Prelinger on 20 Apr 2024
  99. Last observed by Phred Benham on 1 Oct 2023
  100. Last observed by Megan Prelinger on 20 Apr 2024
  101. Last observed by Emilie Strauss on 28 Mar 2022
  102. Last observed by Nat Weber on 16 Mar 2024
  103. Last observed by Megan Prelinger on 10 Feb 2024
  104. Last observed by Vicky Atkinson on 6 Apr 2024
  105. Last observed by Megan Prelinger on 20 Apr 2024
  106. Last observed by Shawn DOHRING on 21 Nov 2023
  107. Last observed by Megan Prelinger on 20 Apr 2024
  108. Last observed by Megan Prelinger on 20 Apr 2024
  109. Last observed by Ron Taylor on 9 Apr 2024
  110. Last observed by Becky Matsubara on 10 Aug 2022
  111. Last observed by Ryan Watson on 17 Jan 2024
  112. Last observed by Megan Prelinger on 20 Apr 2024
  113. Last observed by Megan Prelinger on 20 Apr 2024
  114. Last observed by Alan Chan on 11 Mar 2024
  115. Last observed by Cristina Ruotolo on 6 Jan 2023
  116. Last observed by Ryan Watson on 9 Jan 2024
  117. Last observed by Trevor Leitz on 1 Apr 2024
  118. Last observed by Becky Matsubara on 11 Apr 2024
  119. Last observed by Steve Glover on 17 Oct 1996
  120. Last observed by Nat Weber on 15 Mar 2024
  121. Last observed by Ann Linder on 22 Feb 2024
  122. Last observed by Ethan Monk on 8 Oct 2022
  123. Last observed by Megan Prelinger on 20 Apr 2024
  124. Last observed by Steve Glover on 12 Oct 1996
  125. Last observed by Phred Benham on 1 Jan 2023
  126. Last observed by Mike Hall on 27 Jan 2024
  127. Last observed by Denise Wight on 22 Oct 2016
  128. Last observed by Anonymous eBirder on 25 Jan 2024
  129. Last observed by Kai Mills on 7 Oct 2023
  130. Last observed by Shawn DOHRING on 23 Mar 2024
  131. Last observed by Megan Prelinger on 20 Apr 2024
  132. Last observed by Kate Adams on 15 Feb 2024
  133. Last observed by Vicky Atkinson on 6 Apr 2024
  134. Last observed by Jack Hayden on 9 Sep 2023
  135. Last observed by Jack Hayden on 5 Oct 2023
  136. Last observed by Jack Hayden on 4 Mar 2024
  137. Last observed by Jack Hayden on 16 May 2021
  138. Last observed by Jack Hayden on 9 Sep 2023
  139. Last observed by Melani King on 28 Sep 2023
  140. Last observed by Phred Benham on 12 Oct 2020
  141. Last observed by Jack Hayden on 20 Sep 2021
  142. Last observed by Kai Mills on 7 Oct 2023
  143. Last observed by Megan Prelinger on 20 Apr 2024
  144. Last observed by Chris Wills on 27 Mar 2018
  145. Last observed by Melani King on 2 Feb 2024
  146. Last observed by Ethan Monk on 31 May 2023
  147. Last observed by Melani King on 21 Sep 2023
  148. Last observed by Zac Denning on 8 Apr 2023
  149. Last observed by Jack Hayden on 13 Mar 2024
  150. Last observed by Alex Henry on 7 May 2023
  151. Last observed by Denise Wight on 24 Oct 2017
  152. Last observed by Srikant Char on 6 Oct 2023
  153. Last observed by Kai Mills on 7 Oct 2023
  154. Last observed by Megan Prelinger on 20 Apr 2024
  155. Last observed by Megan Prelinger on 20 Apr 2024
  156. Last observed by Megan Prelinger on 20 Apr 2024
  157. Last observed by Alan Chan on 11 Mar 2024
  158. Last observed by Trevor Leitz on 1 Apr 2024
  159. Last observed by Steve Glover on 17 Oct 1996
  160. Last observed by Phred Benham on 11 May 2019
  161. Last observed by Vicky Atkinson on 6 Apr 2024
  162. Last observed by Megan Prelinger on 20 Apr 2024
  163. Last observed by Nat Weber on 19 Apr 2024
  164. Last observed by Megan Prelinger on 20 Apr 2024
  165. Last observed by Vicky Atkinson on 13 Apr 2024
  166. Last observed by Melani King on 21 Mar 2024
  167. Last observed by Jessica Campbell on 26 Aug 2023
  168. Last observed by Jack Hayden on 13 Mar 2024
  169. Last observed by Bob Dunn on 22 Feb 2024
  170. Last observed by Mike Hall on 27 Jan 2024
  171. Last observed by Megan Prelinger on 10 Feb 2024
  172. Last observed by Nat Weber on 15 Mar 2024
  173. Last observed by Shawn DOHRING on 3 Jan 2024
  174. Last observed by Melani King on 25 Dec 2023
  175. Last observed by Phred Benham on 19 Sep 2020
  176. Last observed by Jack Hayden on 17 Nov 2023
  177. Last observed by Phred Benham on 26 Dec 2022
  178. Last observed by Megan Prelinger on 20 Apr 2024
  179. Last observed by Megan Prelinger on 20 Apr 2024
  180. Last observed by Contra Costa County Historical Record on 7 Mar 2000
  181. Last observed by Megan Prelinger on 20 Apr 2024
  182. Last observed by Megan Prelinger on 20 Apr 2024
  183. Last observed by Ethan Monk on 22 Oct 2022
  184. Last observed by Derek Heins on 23 Sep 2022
  185. Last observed by Megan Prelinger on 20 Apr 2024
  186. Last observed by Nat Weber on 16 Mar 2024
  187. Last observed by Vicky Atkinson on 13 Apr 2024
  188. Last observed by Bob Dunn on 25 Feb 2024
  189. Last observed by Torgil Zethson on 28 Jan 2024
  190. Last observed by Megan Prelinger on 20 Apr 2024
  191. Last observed by Edward Vine on 28 Mar 2024
  192. Last observed by Dan Sidle on 7 Oct 2023
  193. Last observed by Megan Prelinger on 20 Apr 2024
  194. Last observed by Kai Mills on 7 Oct 2023
  195. Last observed by Nat Weber on 16 Mar 2024
  196. Last observed by Jack Hayden on 10 Oct 2022
  197. Last observed by Jim Chiropolos on 14 Sep 2020
  198. Last observed by Jack Hayden on 24 Sep 2021
  199. Last observed by Jack Hayden on 5 Oct 2023
  200. Last observed by Phred Benham on 28 Sep 2019
  201. Last observed by Megan Prelinger on 20 Apr 2024
  202. Last observed by Megan Prelinger on 20 Apr 2024
  203. Last observed by Megan Prelinger on 20 Apr 2024
  204. Last observed by Nat Weber on 19 Apr 2024
  205. Last observed by Melani King on 13 Feb 2024
  206. Last observed by Phred Benham on 25 Sep 2022
  207. Last observed by Jack Hayden on 11 Oct 2023
  208. Last observed by Shawn DOHRING on 23 Mar 2024
  209. Last observed by Torgil Zethson on 28 Jan 2024
  210. Last observed by Megan Prelinger on 20 Apr 2024
  211. Last observed by Megan Prelinger on 20 Apr 2024
  212. Last observed by Melani King on 12 Sep 2021
  213. Last observed by Edward Vine on 28 Mar 2024
  214. Last observed by Melani King on 18 Sep 2023
  215. Last observed by Emilie Strauss on 26 Apr 2023
  216. Last observed by Bob Dunn on 22 Feb 2024
  217. Last observed by logan kahle on 17 Jul 2016
  218. Last observed by Nat Weber on 12 Apr 2024
  219. Last observed by Vicky Atkinson on 6 Apr 2024
  220. Last observed by Phred Benham on 14 Sep 2019
  221. Last observed by Phred Benham on 28 Aug 2021
  222. Last observed by Jim Chiropolos on 30 Sep 2019
  223. Last observed by Nat Weber on 12 Apr 2024
  224. Last observed by Ethan Monk on 24 Sep 2022
  225. Last observed by Ethan Monk on 6 Sep 2022
  226. Last observed by Srikant Char on 6 Oct 2023
  227. Last observed by Phred Benham on 17 Sep 2022
  228. Last observed by Jack Hayden on 11 Oct 2023
  229. Last observed by Robert Lewis on 28 Sep 2011
  230. Last observed by Steve Glover on 16 Oct 1995
  231. Last observed by Melani King on 22 Sep 2020
  232. Last observed by Megan Prelinger on 20 Apr 2024
  233. Last observed by Kai Mills on 7 Oct 2023
  234. Last observed by Melani King on 9 Mar 2024
  235. Last observed by Ethan Monk on 28 Aug 2022
  236. Last observed by Megan Prelinger on 20 Apr 2024
  237. Last observed by Jack Hayden on 11 Oct 2023
  238. Last observed by Ethan Monk on 29 Aug 2023
  239. Last observed by Ethan Monk on 30 Aug 2023

Exotic: Escapee (5)

  1. Last observed by Mike Hall on 28 Dec 2023
  2. Last observed by Anonymous eBirder on 12 Nov 2020
  3. Last observed by Susan Greef on 27 Nov 2020
  4. Last observed by Jack Hayden on 16 Oct 2020
  5. Last observed by Chris Ortega on 28 Aug 2021

Hybrids (7)

  1. Graylag x Swan Goose (hybrid) Anser anser x cygnoides
    Last observed by Jan Sutcher on 12 Feb 2020
  2. Eurasian x American Wigeon (hybrid) Mareca penelope x americana
    Last observed by Judith Dunham on 6 Feb 2020
  3. Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescens
    Last observed by Ivan Munkres on 31 Dec 2023
  4. Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescens
    Last observed by Ethan Monk on 3 Feb 2019
  5. Glaucous x Glaucous-winged Gull (hybrid) Larus hyperboreus x glaucescens
    Last observed by Albert Linkowski on 20 Jan 2016
  6. Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruber
    Last observed by Phred Benham on 7 Jan 2022
  7. Townsend's x Hermit Warbler (hybrid) Setophaga townsendi x occidentalis
    Last observed by Jack Hayden on 2 Oct 2021

Additional Taxa (48)

  1. Snow/Ross's Goose Anser caerulescens/rossii
    Last observed by Gail West on 27 Jan 2018
  2. Domestic goose sp. (Domestic type) Anser sp. (Domestic type)
    Last observed by Ethan Monk on 7 Oct 2022
  3. goose sp. Anatidae (goose sp.)
    Last observed by Dan Roth on 27 Mar 2021
  4. Blue-winged/Cinnamon Teal Spatula discors/cyanoptera
    Last observed by Steve Bonn on 13 May 2023
  5. dabbling duck sp. Anatidae sp. (dabbling duck sp.)
    Last observed by Catherine Fox on 12 Jan 2022
  6. Greater/Lesser Scaup Aythya marila/affinis
    Last observed by Anonymous eBirder on 13 Mar 2024
  7. scoter sp. Melanitta sp.
    Last observed by Anonymous eBirder on 20 Apr 2022
  8. Common/Barrow's Goldeneye Bucephala clangula/islandica
    Last observed by Anonymous eBirder on 9 Mar 2019
  9. duck sp. Anatidae (duck sp.)
    Last observed by Kat Tipton on 24 Feb 2024
  10. Horned/Eared Grebe Podiceps auritus/nigricollis
    Last observed by Anonymous eBirder on 25 Jan 2024
  11. Western/Clark's Grebe Aechmophorus occidentalis/clarkii
    Last observed by Nat Weber on 12 Apr 2024
  12. swift sp. Apodidae sp.
    Last observed by Rick Prelinger on 28 Jan 2024
  13. Rufous/Allen's Hummingbird Selasphorus rufus/sasin
    Last observed by Nat Weber on 15 Mar 2024
  14. hummingbird sp. Trochilidae sp.
    Last observed by Jake Ruygt on 16 Jul 2023
  15. Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceus
    Last observed by Ethan Monk on 13 Jan 2019
  16. Lesser/Greater Yellowlegs Tringa flavipes/melanoleuca
    Last observed by Ralph Hammond on 2 Jan 2021
  17. peep sp. Calidris sp. (peep sp.)
    Last observed by Megan Prelinger on 18 Feb 2023
  18. shorebird sp. Charadriiformes sp.
    Last observed by logan kahle on 8 Oct 2016
  19. jaeger sp. Stercorarius sp. (jaeger sp.)
    Last observed by Phred Benham on 1 Oct 2023
  20. Larus sp. Larus sp.
    Last observed by Ken S on 1 Jul 2023
  21. gull sp. Larinae sp.
    Last observed by Shawn DOHRING on 23 Mar 2024
  22. tern sp. Sterninae sp.
    Last observed by Marjorie Powell on 25 Jul 2023
  23. loon sp. Gavia sp.
    Last observed by Erica Rutherford/ John Colbert on 8 Jan 2023
  24. cormorant sp. Phalacrocoracidae sp.
    Last observed by Nat Weber on 12 Apr 2024
  25. Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperii
    Last observed by Ethan Monk on 7 Oct 2022
  26. Accipiter sp. Accipiter sp.
    Last observed by Erica Rutherford/ John Colbert on 19 Jan 2014
  27. Buteo sp. Buteo sp.
    Last observed by Alex Henry on 30 Jan 2022
  28. hawk sp. Accipitridae sp. (hawk sp.)
    Last observed by Anonymous eBirder on 20 Apr 2022
  29. sapsucker sp. Sphyrapicus sp.
    Last observed by Matt Brady on 14 Jan 2012
  30. Downy/Hairy Woodpecker Dryobates pubescens/villosus
    Last observed by Dan Roth on 25 Sep 2022
  31. woodpecker sp. Picidae sp.
    Last observed by Ethan Monk on 31 May 2023
  32. falcon sp. Falco sp.
    Last observed by Zac Denning on 8 Apr 2023
  33. diurnal raptor sp. Accipitriformes/Falconiformes sp.
    Last observed by Rebecca Laroche on 6 Jan 2023
  34. Empidonax sp. Empidonax sp.
    Last observed by Jack Hayden on 22 Oct 2021
  35. Tree/Violet-green Swallow Tachycineta bicolor/thalassina
    Last observed by Christine Hansel on 16 Jun 2020
  36. swallow sp. Hirundinidae sp.
    Last observed by Vicky Atkinson on 13 Apr 2024
  37. nuthatch sp. Sitta sp.
    Last observed by Roger Kohn on 17 Jun 2021
  38. wren sp. Troglodytidae sp.
    Last observed by Roger Kohn on 10 Jan 2019
  39. Catharus sp. Catharus sp.
    Last observed by Ethan Monk on 7 Oct 2022
  40. House/Purple Finch Haemorhous mexicanus/purpureus
    Last observed by Arthur Wardle on 31 Dec 2019
  41. new world goldfinch sp. Spinus sp. (goldfinch sp.)
    Last observed by Derek Heins on 22 Mar 2023
  42. finch sp. Fringillidae sp.
    Last observed by jerald britten on 26 Aug 2021
  43. Zonotrichia sp. Zonotrichia sp.
    Last observed by Marilyn Kinch on 2 Mar 2024
  44. new world sparrow sp. Passerellidae sp.
    Last observed by Sara Masuda on 13 Aug 2021
  45. new world oriole sp. Icterus sp.
    Last observed by Phred Benham on 4 Sep 2022
  46. blackbird sp. Icteridae sp.
    Last observed by Denise Wight on 3 Sep 2021
  47. new world warbler sp. Parulidae sp.
    Last observed by Srikant Char on 7 Oct 2023
  48. passerine sp. Passeriformes sp.
    Last observed by Jack Hayden on 11 Sep 2022