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Illustrated Checklist

 Powered by Macaulay Library and eBird
Updated ~12 hours ago
368 Species Observed
Species w/ Photos
Species w/ Audio
Species Needing Photos
Species Needing Audio
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Native and Naturalized (367)

  1. Last observed by Logan Smith on 14 Apr 2024
  2. Last observed by Steven Mlodinow on 8 Apr 2024
  3. Last observed by Brian Genge on 26 Mar 2024
  4. Last observed by Jack Robinson on 3 Feb 2024
  5. Last observed by Mark Peterson on 12 Apr 2024
  6. Last observed by Kathy Mihm Dunning on 3 Mar 2021
  7. Last observed by Kathryn Kay on 26 Nov 2023
  8. Last observed by Chris Goulart on 22 Oct 2023
  9. Last observed by Geree Rea on 21 Apr 2024
  10. Last observed by Geree Rea on 18 Apr 2024
  11. Last observed by Geree Rea on 21 Apr 2024
  12. Last observed by Brad Steger on 21 Apr 2024
  13. Last observed by Steven Mlodinow on 27 Oct 2018
  14. Last observed by Geree Rea on 21 Apr 2024
  15. Last observed by Geree Rea on 21 Apr 2024
  16. Last observed by Steven Mlodinow on 29 Jul 2023
  17. Last observed by Colorado Bird Records Committee on 7 Feb 1999
  18. Last observed by Anonymous eBirder on 6 Aug 2018
  19. Last observed by Brad Steger on 21 Apr 2024
  20. Last observed by Geree Rea on 21 Apr 2024
  21. Last observed by Brian Genge on 13 Apr 2024
  22. Last observed by Brad Steger on 21 Apr 2024
  23. Last observed by Brad Steger on 21 Apr 2024
  24. Last observed by Steven Mlodinow on 22 Nov 2023
  25. Last observed by Brad Steger on 21 Apr 2024
  26. Last observed by David Dowell on 14 Nov 2021
  27. Last observed by Steven Mlodinow on 10 Nov 2020
  28. Last observed by Sean Huntley on 18 Nov 2023
  29. Last observed by John Haycraft on 27 Mar 2024
  30. Last observed by Geree Rea on 21 Apr 2024
  31. Last observed by Brad Steger on 21 Apr 2024
  32. Last observed by Steven Mlodinow on 28 Jan 2018
  33. Last observed by Logan Smith on 14 Apr 2024
  34. Last observed by Miles Mcevoy on 19 Apr 2024
  35. Last observed by Darth Aves on 11 Mar 2024
  36. Last observed by Brad Steger on 21 Apr 2024
  37. Last observed by Brad Steger on 21 Apr 2024
  38. Last observed by Brad Steger on 21 Apr 2024
  39. Last observed by Brian Genge on 13 Apr 2024
  41. Last observed by Brad Steger on 21 Apr 2024
  42. Last observed by Brad Steger on 21 Apr 2024
  43. Last observed by Glenn Walbek on 16 Nov 2023
  44. Last observed by Brad Steger on 21 Apr 2024
  45. Last observed by Brad Steger on 21 Apr 2024
  46. Last observed by Steven Mlodinow on 8 Apr 2024
  47. Last observed by Brad Steger on 21 Apr 2024
  48. Last observed by Geree Rea on 21 Apr 2024
  49. Last observed by Steven Mlodinow on 25 Jul 2023
  50. Last observed by Geree Rea on 21 Apr 2024
  51. Last observed by David Suddjian on 27 Jul 2022
  52. Last observed by Steven Mlodinow on 5 Sep 2023
  53. Last observed by Steven Mlodinow on 10 Sep 2017
  54. Last observed by Steven Mlodinow on 4 Aug 2018
  55. Last observed by David Dowell on 21 Sep 2023
  56. Last observed by Curtis Higgins on 27 May 2021
  57. Last observed by David Suddjian on 30 Aug 2023
  58. Last observed by Steven Mlodinow on 12 Sep 2020
  59. Last observed by Cole Wild on 3 May 2023
  60. Last observed by Steven Mlodinow on 16 Aug 2021
  61. Last observed by Luke Pheneger on 8 Aug 2022
  62. Last observed by Luke Pheneger on 8 Aug 2022
  63. Last observed by Steven Mlodinow on 17 Apr 2021
  64. Last observed by Kathy Mihm Dunning on 9 Sep 2023
  65. Last observed by Mark Peterson on 17 Apr 2024
  66. Last observed by Brad Steger on 21 Apr 2024
  68. Last observed by Glenn Walbek on 28 Mar 2024
  69. Last observed by Brandon K. Percival on 1 Nov 2006
  70. Last observed by Geree Rea on 21 Apr 2024
  71. Last observed by Brad Steger on 21 Apr 2024
  72. Last observed by Jeff Stacey on 20 Apr 2024
  73. Last observed by Geree Rea on 5 Oct 2023
  74. Last observed by Geree Rea on 21 Apr 2024
  75. Last observed by Brad Steger on 21 Apr 2024
  76. Last observed by David Suddjian on 30 Aug 2023
  77. Last observed by Ross Gallardy on 7 May 2023
  78. Last observed by Geree Rea on 21 Apr 2024
  79. Last observed by Nick Schleissmann on 5 Sep 2023
  80. Last observed by Jacqui Geiselman on 6 May 2023
  81. Last observed by Brad Steger on 21 Apr 2024
  82. Last observed by Steven Mlodinow on 20 Jun 2023
  83. Last observed by Geree Rea on 21 Apr 2024
  84. Last observed by David Suddjian on 31 Aug 2023
  85. Last observed by Geree Rea on 21 Apr 2024
  86. Last observed by Brian Genge on 13 Apr 2024
  87. Last observed by Brad Steger on 21 Apr 2024
  88. Last observed by Steven Mlodinow on 27 Oct 2018
  89. Last observed by Jeff Birek on 27 Sep 2023
  90. Last observed by Steven Mlodinow on 22 Sep 2023
  91. Last observed by Luke Pheneger on 2 Sep 2023
  92. Last observed by Geree Rea on 21 Apr 2024
  93. Last observed by Geree Rea on 21 Apr 2024
  94. Last observed by Geree Rea on 21 Apr 2024
  95. Last observed by Steven Mlodinow on 14 May 2020
  96. Last observed by Janeal W. Thompson on 8 Oct 2017
  97. Last observed by David Dowell on 27 Apr 2018
  98. Last observed by Tony Leukering on 1 Jul 1998
  99. Last observed by Geree Rea on 5 Oct 2023
  100. Last observed by Glenn Walbek on 25 Aug 2023
  101. Last observed by Brad Steger on 21 Apr 2024
  102. Last observed by Luke Pheneger on 15 May 2023
  103. Last observed by Geree Rea on 21 Apr 2024
  104. Last observed by Steven Mlodinow on 20 Jun 2023
  105. Last observed by Geree Rea on 21 Apr 2024
  106. Last observed by Bill Wright_cc on 18 Oct 2023
  107. Last observed by Brad Steger on 21 Apr 2024
  108. Last observed by Brad Steger on 21 Apr 2024
  109. Last observed by Gary Koehn on 4 Nov 2013
  110. Last observed by Steven Mlodinow on 19 Sep 2017
  111. Last observed by Janeal W. Thompson on 14 Aug 2017
  112. Last observed by Cole Wild on 12 Dec 2023
  113. Last observed by John Drummond on 25 Sep 2023
  114. Last observed by Brad Steger on 21 Apr 2024
  115. Last observed by Steven Mlodinow on 22 Sep 2023
  116. Last observed by Brad Steger on 21 Apr 2024
  117. Last observed by Steven Mlodinow on 19 Jan 2021
  118. Last observed by Brad Steger on 21 Apr 2024
  119. Last observed by Darth Aves on 18 Mar 2024
  120. Last observed by Steven Mlodinow on 11 Mar 2021
  121. Last observed by David Dowell on 16 Feb 2020
  122. Last observed by Brian Genge on 16 Feb 2024
  123. Last observed by Brad Steger on 21 Apr 2024
  124. Last observed by Steven Mlodinow on 19 Jan 2021
  125. Last observed by Steven Mlodinow on 8 Dec 2023
  126. Last observed by Loch Kilpatrick on 21 Jul 2001
  127. Last observed by Steven Mlodinow on 10 Jun 2020
  128. Last observed by David Suddjian on 30 Aug 2023
  129. Last observed by Steven Mlodinow on 22 Sep 2023
  130. Last observed by Brad Steger on 21 Apr 2024
  131. Last observed by John Drummond on 11 May 2019
  132. Last observed by Geree Rea on 5 Oct 2023
  133. Last observed by Norman Erthal on 16 Jul 1997
  134. Last observed by Steven Mlodinow on 8 Dec 2023
  135. Last observed by Luke Pheneger on 21 Nov 2020
  136. Last observed by Norman Erthal on 27 Nov 2023
  137. Last observed by Brad Steger on 21 Apr 2024
  138. Last observed by Steven Mlodinow on 17 Jul 2023
  139. Last observed by Geree Rea on 21 Apr 2024
  140. Last observed by Colorado Bird Records Committee on 18 Aug 1992
  141. Last observed by Steven Mlodinow on 18 Sep 2018
  142. Last observed by Loch Kilpatrick on 5 Aug 2018
  143. Last observed by Lisa Edwards on 3 Sep 2016
  144. Last observed by Curtis Higgins on 3 May 2023
  145. Last observed by Steven Mlodinow on 22 Apr 2018
  146. Last observed by John Drummond on 6 Aug 2018
  147. Last observed by Anonymous eBirder on 5 Jul 2013
  148. Last observed by Al Garner on 24 Apr 2023
  149. Last observed by Lisa Edwards on 14 May 2021
  150. Last observed by David Suddjian on 24 Oct 2023
  151. Last observed by Geree Rea on 2 Oct 2023
  152. Last observed by Geree Rea on 21 Apr 2024
  153. Last observed by Colorado Bird Records Committee on 28 Jul 1985
  154. Last observed by Luke Pheneger on 22 Apr 2023
  155. Last observed by John Drummond on 25 Sep 2023
  156. Last observed by Brad Steger on 21 Apr 2024
  157. Last observed by Glenn Walbek on 28 Mar 2024
  158. Last observed by Brian Genge on 16 Feb 2024
  159. Last observed by Cole Sage on 18 Aug 2023
  160. Last observed by Brad Steger on 21 Apr 2024
  161. Last observed by Seth Owens on 6 Apr 2024
  162. Last observed by Paul Turelli on 21 Mar 2024
  163. Last observed by Brad Steger on 21 Apr 2024
  164. Last observed by matt newport on 23 Apr 2023
  165. Last observed by Norman Erthal on 11 May 2023
  166. Last observed by Brad Steger on 21 Apr 2024
  167. Last observed by Brad Steger on 21 Apr 2024
  168. Last observed by Tom Slyker on 1 Apr 2024
  169. Last observed by Felice Lyons on 12 Apr 2024
  170. Last observed by Luke Pheneger on 13 Apr 2024
  171. Last observed by Steven Mlodinow on 12 Sep 2020
  172. Last observed by Janeal W. Thompson on 4 Mar 2018
  173. Last observed by Jon (Yonatan) Rubins on 13 Apr 2024
  174. Last observed by Evalynn Trumbo on 17 Apr 2024
  176. Last observed by Sean Huntley on 17 Nov 2023
  177. Last observed by Steven Mlodinow on 1 Jan 2020
  178. Last observed by Chris Goulart on 22 Oct 2023
  179. Last observed by Steven Mlodinow on 26 Sep 2017
  180. Last observed by Steven Mlodinow on 22 Sep 2020
  181. Last observed by Tony Leukering on 11 May 2019
  182. Last observed by David Dowell on 10 Sep 2023
  183. Last observed by Steven Mlodinow on 5 Jan 2024
  184. Last observed by Logan Smith on 14 Apr 2024
  185. Last observed by Cole Sage on 18 Aug 2023
  186. Last observed by Nick Schleissmann on 5 Sep 2023
  187. Last observed by Brad Steger on 21 Apr 2024
  188. Last observed by Rory Van Lieu on 18 Apr 2024
  189. Last observed by Brian Genge on 13 Apr 2024
  190. Last observed by David Suddjian on 30 Aug 2023
  191. Last observed by Glenn Walbek on 28 Mar 2024
  192. Last observed by Steven Mlodinow on 5 Sep 2023
  193. Last observed by David Dowell on 10 Sep 2023
  194. Last observed by Steven Mlodinow on 19 May 2021
  195. Last observed by Joey Kellner on 6 May 2022
  196. Last observed by Steven Mlodinow on 5 Sep 2023
  197. Last observed by Nick Schleissmann on 5 Sep 2023
  198. Last observed by Norman Erthal on 25 Sep 2020
  199. Last observed by Cole Sage on 13 Sep 2020
  200. Last observed by Luke Pheneger on 2 Sep 2023
  201. Last observed by Steven Mlodinow on 22 Sep 2020
  202. Last observed by David Dowell on 9 Oct 2022
  203. Last observed by Geree Rea on 21 Apr 2024
  204. Last observed by Christine Alexander on 12 May 2023
  205. Last observed by Steven Mlodinow on 5 Sep 2023
  206. Last observed by Steven Mlodinow on 22 Sep 2023
  207. Last observed by Geree Rea on 21 Apr 2024
  208. Last observed by David Dowell on 10 Sep 2023
  209. Last observed by Christopher Pague on 17 May 2022
  210. Last observed by Steven Mlodinow on 20 May 2018
  211. Last observed by Nick Schleissmann on 5 Sep 2023
  212. Last observed by Joey Kellner on 8 May 2022
  213. Last observed by Glenn Walbek on 5 Oct 2023
  214. Last observed by Riley Morris on 9 May 2021
  215. Last observed by Steven Mlodinow on 14 May 2020
  216. Last observed by Geree Rea on 30 Sep 2023
  217. Last observed by Geree Rea on 30 Sep 2023
  218. Last observed by Kathy Mihm Dunning on 9 Sep 2023
  219. Last observed by Geree Rea on 21 Apr 2024
  220. Last observed by Brian Genge on 15 Feb 2024
  221. Last observed by Steven Mlodinow on 9 Nov 2023
  222. Last observed by Steven Mlodinow on 21 Oct 2020
  223. Last observed by Brad Steger on 21 Apr 2024
  224. Last observed by Geree Rea on 12 Nov 2023
  225. Last observed by Brad Steger on 21 Apr 2024
  226. Last observed by Geree Rea on 8 Oct 2023
  227. Last observed by Glenn Walbek on 17 Sep 2000
  228. Last observed by Darth Aves on 19 Oct 2020
  229. Last observed by Brad Steger on 21 Apr 2024
  230. Last observed by Brad Steger on 21 Apr 2024
  231. Last observed by Brian Genge on 13 Apr 2024
  232. Last observed by David Suddjian on 11 May 2022
  233. Last observed by Robert Tonge on 20 Aug 2023
  234. Last observed by Brad Steger on 21 Apr 2024
  235. Last observed by Geree Rea on 21 Apr 2024
  236. Last observed by Steven Mlodinow on 10 Nov 2018
  237. Last observed by Steven Mlodinow on 19 Oct 2023
  238. Last observed by Steven Mlodinow on 9 Nov 2023
  239. Last observed by Luke Pheneger on 21 Nov 2020
  240. Last observed by Glenn Walbek on 5 Oct 2023
  241. Last observed by David Dowell on 9 Oct 2022
  242. Last observed by Geree Rea on 30 Sep 2023
  243. Last observed by Geree Rea on 18 Apr 2024
  244. Last observed by Geree Rea on 2 Oct 2023
  245. Last observed by David de Rivera Tønnessen on 20 Oct 2018
  246. Last observed by Steven Mlodinow on 30 Sep 2018
  247. Last observed by Darth Aves on 11 Mar 2024
  248. Last observed by Steven Mlodinow on 25 Aug 2018
  249. Last observed by Steven Mlodinow on 22 Sep 2023
  250. Last observed by Geree Rea on 21 Apr 2024
  251. Last observed by David Dowell on 10 Sep 2023
  252. Last observed by Al Garner on 24 Apr 2023
  253. Last observed by David Dowell on 10 Sep 2023
  254. Last observed by Steven Mlodinow on 2 Aug 2023
  255. Last observed by Brad Steger on 21 Apr 2024
  256. Last observed by Steven Mlodinow on 14 Mar 2023
  257. Last observed by Darth Aves on 11 Mar 2024
  258. Last observed by Sean Huntley on 18 Nov 2023
  259. Last observed by Steven Mlodinow on 10 Nov 2018
  260. Last observed by David Dowell on 10 Sep 2023
  261. Last observed by Nick Moore on 14 May 2023
  262. Last observed by David Dowell on 10 Sep 2023
  263. Last observed by David Dowell on 10 Sep 2023
  264. Last observed by David Dowell on 2 May 2020
  265. Last observed by Steven Mlodinow on 8 Apr 2024
  266. Last observed by Luke Pheneger on 2 Sep 2023
  267. Last observed by Brad Steger on 21 Apr 2024
  268. Last observed by Geree Rea on 3 Apr 2024
  269. Last observed by Steven Mlodinow on 8 Apr 2024
  270. Last observed by Steven Mlodinow on 13 Jan 2018
  271. Last observed by Steven Mlodinow on 17 Jul 2023
  272. Last observed by Geree Rea on 5 Nov 2023
  273. Last observed by Cole Sage on 2 Sep 2023
  274. Last observed by Steven Mlodinow on 8 Apr 2024
  275. Last observed by Steven Mlodinow on 5 Jan 2024
  276. Last observed by Glenn Walbek on 15 Apr 2024
  277. Last observed by Glenn Walbek on 12 Oct 2003
  278. Last observed by Brian Genge on 13 Apr 2024
  279. Last observed by Steven Mlodinow on 22 Nov 2023
  280. Last observed by David Suddjian on 30 Aug 2023
  281. Last observed by Evalynn Trumbo on 17 Apr 2024
  282. Last observed by Geree Rea on 21 Apr 2024
  283. Last observed by Steven Mlodinow on 19 Oct 2023
  284. Last observed by Steven Mlodinow on 22 Nov 2023
  285. Last observed by Steven Mlodinow on 9 Nov 2023
  286. Last observed by Geree Rea on 21 Apr 2024
  287. Last observed by Evalynn Trumbo on 17 Apr 2024
  288. Last observed by Geree Rea on 24 Mar 2024
  289. Last observed by Steven Mlodinow on 22 Nov 2023
  290. Last observed by Geree Rea on 14 Jan 2024
  291. Last observed by Brad Steger on 21 Apr 2024
  292. Last observed by Steven Mlodinow on 18 Nov 2018
  293. Last observed by Brad Steger on 21 Apr 2024
  294. Last observed by Cole Sage on 18 Nov 2023
  295. Last observed by Geree Rea on 21 Apr 2024
  296. Last observed by Geree Rea on 21 Apr 2024
  297. Last observed by Colorado Bird Records Committee on 16 Sep 1939
  298. Last observed by Steven Mlodinow on 8 Apr 2024
  299. Last observed by Geree Rea on 12 Nov 2023
  300. Last observed by Byron Greco on 9 Oct 2020
  301. Last observed by Van Truan on 6 Feb 1971
  302. Last observed by David de Rivera Tønnessen on 22 Sep 2019
  303. Last observed by kathy dupont on 24 Sep 2020
  304. Last observed by Geree Rea on 18 Apr 2024
  305. Last observed by David Dowell on 10 Sep 2023
  306. Last observed by Brad Steger on 21 Apr 2024
  307. Last observed by Geree Rea on 21 Apr 2024
  308. Last observed by Steven Mlodinow on 22 May 2020
  309. Last observed by Steven Mlodinow on 25 Jul 2023
  310. Last observed by Nick Schleissmann on 5 Sep 2023
  311. Last observed by Steven Mlodinow on 5 Sep 2023
  312. Last observed by Joey Kellner on 7 May 2023
  313. Last observed by Geree Rea on 21 Apr 2024
  314. Last observed by Geree Rea on 21 Apr 2024
  315. Last observed by Kevin Ash on 1 Nov 2020
  316. Last observed by Brad Steger on 21 Apr 2024
  317. Last observed by Brad Steger on 21 Apr 2024
  318. Last observed by Jeff Stacey on 20 Apr 2024
  319. Last observed by Brian Genge on 26 Sep 2022
  320. Last observed by matt newport on 17 May 2020
  321. Last observed by Joey Kellner on 6 May 2022
  322. Last observed by Colorado Bird Records Committee on 1 May 1994
  323. Last observed by David Dowell on 13 May 2018
  324. Last observed by Nick Moore on 14 May 2023
  325. Last observed by Kathy Mihm Dunning on 6 May 2019
  326. Last observed by Sean Huntley on 2 Sep 2023
  327. Last observed by Brad Steger on 21 Apr 2024
  328. Last observed by Joey Kellner on 6 May 2022
  329. Last observed by Dean Shoup on 6 May 2022
  330. Last observed by Luke Pheneger on 2 Sep 2023
  331. Last observed by Jane Stulp on 8 Sep 2014
  332. Last observed by Steven Mlodinow on 20 May 2018
  333. Last observed by Steven Mlodinow on 19 Oct 2023
  334. Last observed by Glenn Walbek on 29 Apr 2022
  335. Last observed by David Dowell on 10 Sep 2023
  336. Last observed by Steven Mlodinow on 22 May 2020
  337. Last observed by Joey Kellner on 11 May 2023
  338. Last observed by Glenn Walbek on 17 May 2023
  339. Last observed by Steven Mlodinow on 10 May 2018
  340. Last observed by Glenn Walbek on 11 Sep 2017
  341. Last observed by Nick Schleissmann on 5 Sep 2023
  342. Last observed by Joey Kellner on 7 May 2023
  343. Last observed by David Dowell on 10 Sep 2023
  344. Last observed by Cole Sage on 16 May 2020
  345. Last observed by David Dowell on 6 May 2022
  346. Last observed by David Suddjian on 16 Sep 2022
  347. Last observed by Bob Martinka on 20 Apr 2024
  348. Last observed by Steven Mlodinow on 15 May 2014
  349. Last observed by Nathan Pieplow on 2 May 2004
  350. Last observed by Steven Mlodinow on 14 May 2020
  351. Last observed by Luke Pheneger on 2 Sep 2023
  352. Last observed by Brandon K. Percival on 6 May 2001
  353. Last observed by Norman Erthal on 11 May 2023
  354. Last observed by John Malenich on 3 May 2020
  355. Last observed by Geree Rea on 30 Sep 2023
  356. Last observed by Duwayne Worthington on 4 May 2019
  357. Last observed by Steven Mlodinow on 13 May 2022
  358. Last observed by Brandon K. Percival on 4 May 2020
  359. Last observed by Norman Erthal on 11 May 2023
  360. Last observed by Steven Mlodinow on 5 Sep 2023
  361. Last observed by Glenn Walbek on 17 May 2023
  362. Last observed by Geree Rea on 30 Sep 2023
  363. Last observed by David Dowell on 10 Sep 2023
  364. Last observed by Nick Schleissmann on 5 Sep 2023
  365. Last observed by Norman Erthal on 11 May 2023
  366. Last observed by Steven Mlodinow on 30 Sep 2018
  367. Last observed by David Dowell on 10 Sep 2023

Exotic: Provisional (1)

  1. Last observed by Geree Rea on 21 Apr 2024

Hybrids (21)

  1. Snow x Ross's Goose (hybrid) Anser caerulescens x rossii
    Last observed by Steven Mlodinow on 11 Feb 2018
  2. Snow x Greater White-fronted Goose (hybrid) Anser caerulescens x albifrons
    Last observed by Steven Mlodinow on 7 Dec 2019
  3. Snow x Cackling Goose (hybrid) Anser caerulescens x Branta hutchinsii
    Last observed by Steven Mlodinow on 7 Dec 2019
  4. Ross's x Cackling Goose (hybrid) Anser rossii x Branta hutchinsii
    Last observed by Steven Mlodinow on 1 Jan 2020
  5. Snow/Ross's x Cackling/Canada Goose (hybrid) Anser caerulescens/rossii x Branta hutchinsii/canadensis
    Last observed by Steven Mlodinow on 7 Dec 2019
  6. American Wigeon x Mallard (hybrid) Mareca americana x Anas platyrhynchos
    Last observed by Steven Mlodinow on 9 Nov 2019
  7. Gadwall x Northern Pintail (hybrid) Mareca strepera x Anas acuta
    Last observed by Steven Mlodinow on 19 Mar 2016
  8. Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acuta
    Last observed by Steven Mlodinow on 7 Dec 2019
  9. Northern Bobwhite x Scaled Quail (hybrid) Colinus virginianus x Callipepla squamata
    Last observed by Steven Mlodinow on 29 May 2018
  10. Western x Clark's Grebe (hybrid) Aechmophorus occidentalis x clarkii
    Last observed by Steven Mlodinow on 17 Jul 2020
  11. Ruby-throated x Black-chinned Hummingbird (hybrid) Archilochus colubris x alexandri
    Last observed by Steven Mlodinow on 11 Aug 2020
  12. Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreus
    Last observed by Steven Mlodinow on 22 Apr 2018
  13. Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescens
    Last observed by David Dowell on 16 Feb 2020
  14. Double-crested x Neotropic Cormorant (hybrid) Nannopterum auritum x brasilianum
    Last observed by Steven Mlodinow on 11 Aug 2018
  15. Glossy x White-faced Ibis (hybrid) Plegadis falcinellus x chihi
    Last observed by Mark Peterson on 26 Apr 2019
  16. Red-tailed x Ferruginous Hawk (hybrid) Buteo jamaicensis x regalis
    Last observed by Steven Mlodinow on 14 Mar 2023
  17. Chipping x Field Sparrow (hybrid) Spizella passerina x pusilla
    Last observed by Steven Mlodinow on 12 Sep 2020
  18. Spotted x Eastern Towhee (hybrid) Pipilo maculatus x erythrophthalmus
    Last observed by Steven Mlodinow on 2 Dec 2018
  19. Western x Eastern Meadowlark (hybrid) Sturnella neglecta x magna
    Last observed by Steven Mlodinow on 17 Apr 2021
  20. Bullock's x Baltimore Oriole (hybrid) Icterus bullockii x galbula
    Last observed by Steven Mlodinow on 25 Jul 2023
  21. Lazuli x Indigo Bunting (hybrid) Passerina amoena x cyanea
    Last observed by Steven Mlodinow on 20 May 2018

Additional Taxa (91)

  1. Snow/Ross's Goose Anser caerulescens/rossii
    Last observed by Brian Genge on 27 Mar 2024
  2. Cackling/Canada Goose Branta hutchinsii/canadensis
    Last observed by Norman Erthal on 27 Nov 2023
  3. goose sp. Anatidae (goose sp.)
    Last observed by Brian Genge on 16 Feb 2024
  4. Blue-winged/Cinnamon Teal Spatula discors/cyanoptera
    Last observed by Steven Mlodinow on 25 Jul 2023
  5. Mallard/Mexican Duck Anas platyrhynchos/diazi
    Last observed by David de Rivera Tønnessen on 2 Sep 2018
  6. teal sp. Anatidae sp. (teal sp.)
    Last observed by John Drummond on 25 Sep 2023
  7. dabbling duck sp. Anatidae sp. (dabbling duck sp.)
    Last observed by Brian Genge on 27 Mar 2024
  8. Greater/Lesser Scaup Aythya marila/affinis
    Last observed by Glenn Walbek on 15 Apr 2024
  9. Aythya sp. Aythya sp.
    Last observed by Brian Genge on 27 Mar 2024
  10. Common/Barrow's Goldeneye Bucephala clangula/islandica
    Last observed by David Dowell on 11 Nov 2020
  11. Common/Red-breasted Merganser Mergus merganser/serrator
    Last observed by Josh Lefever on 28 Nov 2020
  12. duck sp. Anatidae (duck sp.)
    Last observed by Geree Rea on 14 Apr 2024
  13. Ring-necked/Green Pheasant Phasianus colchicus/versicolor
    Last observed by Jesse Casias on 30 Apr 2023
  14. Horned/Eared Grebe Podiceps auritus/nigricollis
    Last observed by Kathryn Kay on 26 Nov 2023
  15. Western/Clark's Grebe Aechmophorus occidentalis/clarkii
    Last observed by Craig Robson on 1 Apr 2024
  16. grebe sp. Podicipedidae sp.
    Last observed by Gabriela Zaldumbide on 17 Nov 2018
  17. pigeon/dove sp. Columbidae sp.
    Last observed by Jedediah Smith on 5 May 2023
  18. nighthawk sp. Chordeiles sp.
    Last observed by Ben Sampson on 2 Sep 2023
  19. Ruby-throated/Black-chinned Hummingbird Archilochus colubris/alexandri
    Last observed by Steven Mlodinow on 16 Aug 2021
  20. Selasphorus sp. Selasphorus sp.
    Last observed by Tony Leukering on 23 Aug 2019
  21. hummingbird sp. Trochilidae sp.
    Last observed by Richard Taylor on 19 Aug 2020
  22. Black-bellied Plover/golden-plover sp. Pluvialis sp.
    Last observed by David Dowell on 21 Sep 2023
  23. small plover sp. Charadrius/Anarhynchus sp.
    Last observed by Bob Spencer on 29 May 2023
  24. Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceus
    Last observed by Glenn Walbek on 1 May 2023
  25. Red/Red-necked Phalarope Phalaropus fulicarius/lobatus
    Last observed by Chris Rurik on 10 Oct 2015
  26. phalarope sp. Phalaropus sp.
    Last observed by David Suddjian on 30 Aug 2023
  27. Lesser/Greater Yellowlegs Tringa flavipes/melanoleuca
    Last observed by Hannah Criswell on 30 Apr 2023
  28. Western/Semipalmated Sandpiper Calidris mauri/pusilla
    Last observed by David Dowell on 20 Aug 2022
  29. peep sp. Calidris sp. (peep sp.)
    Last observed by John Drummond on 25 Sep 2023
  30. Calidris sp. Calidris sp.
    Last observed by Jeff Birek on 27 Sep 2023
  31. large shorebird sp. Scolopacidae sp. (large shorebird sp.)
    Last observed by Brian Devine on 29 Apr 2023
  32. shorebird sp. Charadriiformes sp.
    Last observed by Geree Rea on 14 Apr 2024
  33. Herring/Iceland Gull Larus argentatus/glaucoides
    Last observed by Ted Floyd on 10 Feb 2019
  34. Larus sp. Larus sp.
    Last observed by Eric DeFonso 🦑 on 2 Feb 2024
  35. gull sp. Larinae sp.
    Last observed by Logan Smith on 14 Apr 2024
  36. Forster's/Common Tern Sterna forsteri/hirundo
    Last observed by Michael Lester on 7 May 2021
  37. Sterna sp. Sterna sp.
    Last observed by David Dowell on 21 Sep 2023
  38. tern sp. Sterninae sp.
    Last observed by Audrey Curtis on 30 Jun 2023
  39. loon sp. Gavia sp.
    Last observed by Cole Sage on 11 Nov 2020
  40. Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianum
    Last observed by Steven Mlodinow on 17 Jul 2023
  41. cormorant sp. Phalacrocoracidae sp.
    Last observed by David de Rivera Tønnessen on 4 May 2018
  42. heron sp. Ardeidae sp.
    Last observed by Steve Larson on 2 Nov 2019
  43. white egret sp. Egretta/Bubulcus/Ardea sp.
    Last observed by Cole Sage on 13 Aug 2020
  44. Glossy/White-faced Ibis Plegadis falcinellus/chihi
    Last observed by Joey Kellner on 3 Jul 2022
  45. Buteo sp. Buteo sp.
    Last observed by Bob Martinka on 20 Apr 2024
  46. Buteo/eagle sp. Buteo/eagle sp.
    Last observed by G J on 3 Feb 2024
  47. hawk sp. Accipitridae sp. (hawk sp.)
    Last observed by Charlie Paterson on 8 Apr 2022
  48. owl sp. Strigiformes sp.
    Last observed by Bill Sain on 7 Apr 2016
  49. Yellow-bellied/Red-naped Sapsucker Sphyrapicus varius/nuchalis
    Last observed by Oliver Burton on 20 Apr 2015
  50. woodpecker sp. Picidae sp.
    Last observed by Leo Bix on 2 Dec 2023
  51. small falcon sp. Falco sp. (small falcon sp.)
    Last observed by Dave Hawksworth on 13 Mar 2015
  52. falcon sp. Falco sp.
    Last observed by Christina Leslie on 10 Feb 2019
  53. diurnal raptor sp. Accipitriformes/Falconiformes sp.
    Last observed by Brian Genge on 16 Feb 2024
  54. Western/Eastern Wood-Pewee Contopus sordidulus/virens
    Last observed by Timo Mitzen on 7 May 2019
  55. pewee sp. (Contopus sp.) Contopus sp.
    Last observed by Cole Sage on 16 May 2020
  56. Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/traillii
    Last observed by Forrest Rowland on 14 May 2020
  57. Gray/Dusky Flycatcher Empidonax wrightii/oberholseri
    Last observed by Beth Sage on 13 Sep 2020
  58. Empidonax sp. Empidonax sp.
    Last observed by Luke Pheneger on 2 Sep 2023
  59. Cassin's/Western Kingbird Tyrannus vociferans/verticalis
    Last observed by David Dowell on 21 Sep 2023
  60. yellow-bellied kingbird sp. Tyrannus sp. (yellow-bellied)
    Last observed by David de Rivera Tønnessen on 20 Aug 2018
  61. new world flycatcher sp. Tyrannidae sp.
    Last observed by Wolfe R on 16 May 2020
  62. Cassin's/Blue-headed Vireo Vireo cassinii/solitarius
    Last observed by Cole Sage on 10 May 2020
  63. solitary vireo sp. Vireo cassinii/solitarius/plumbeus
    Last observed by Luke Pheneger on 2 Sep 2023
  64. vireo sp. Vireo sp.
    Last observed by Gary Koehn on 11 May 2019
  65. Loggerhead/Northern Shrike Lanius ludovicianus/borealis
    Last observed by Steven Mlodinow on 14 Mar 2023
  66. raven sp. Corvus sp. (raven sp.)
    Last observed by Logan Smith on 14 Apr 2024
  67. Cliff/Cave Swallow Petrochelidon pyrrhonota/fulva
    Last observed by Denver Field Ornithologists on 25 Apr 2022
  68. swallow sp. Hirundinidae sp.
    Last observed by David Suddjian on 20 Aug 2023
  69. Sedge/Marsh Wren Cistothorus stellaris/palustris
    Last observed by Tony Leukering on 24 Nov 2018
  70. wren sp. Troglodytidae sp.
    Last observed by kathy dupont on 24 Sep 2020
  71. Catharus sp. Catharus sp.
    Last observed by Luke Pheneger on 6 May 2021
  72. finch sp. Fringillidae sp.
    Last observed by Tony Leukering on 23 Oct 2018
  73. longspur sp. Calcarius/Rhynchophanes sp.
    Last observed by Kathryn Kay on 26 Nov 2023
  74. Spizella sp. Spizella sp.
    Last observed by David Dowell on 21 Sep 2023
  75. Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.
    Last observed by Gary Koehn on 18 Mar 2019
  76. Zonotrichia sp. Zonotrichia sp.
    Last observed by David Dowell on 3 May 2020
  77. new world sparrow sp. Passerellidae sp.
    Last observed by David Suddjian on 24 Oct 2023
  78. Western/Eastern Meadowlark Sturnella neglecta/magna
    Last observed by Marie Cecile Lee on 30 Apr 2023
  79. Eastern/Chihuahuan Meadowlark Sturnella magna/lilianae
    Last observed by Steven Mlodinow on 17 Jul 2023
  80. Sturnella meadowlark sp. Sturnella sp.
    Last observed by Cole Sage on 18 Nov 2023
  81. Bullock's/Baltimore Oriole Icterus bullockii/galbula
    Last observed by David de Rivera Tønnessen on 15 May 2020
  82. new world oriole sp. Icterus sp.
    Last observed by Nick Schleissmann on 5 Sep 2023
  83. Rusty/Brewer's Blackbird Euphagus carolinus/cyanocephalus
    Last observed by David Dowell on 8 Oct 2022
  84. grackle sp. Quiscalus sp.
    Last observed by Laura Davis on 5 Jul 2021
  85. blackbird sp. Icteridae sp.
    Last observed by Brian Genge on 27 Mar 2024
  86. MacGillivray's/Mourning Warbler Geothlypis tolmiei/philadelphia
    Last observed by David de Rivera Tønnessen on 15 May 2020
  87. new world warbler sp. Parulidae sp.
    Last observed by Nick Schleissmann on 5 Sep 2023
  88. Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalus
    Last observed by Steven Mlodinow on 3 May 2023
  89. Lazuli/Indigo Bunting Passerina amoena/cyanea
    Last observed by Luke Pheneger on 5 May 2020
  90. passerine sp. Passeriformes sp.
    Last observed by Luke Pheneger on 2 Sep 2023
  91. bird sp. Aves sp.
    Last observed by David de Rivera Tønnessen on 27 Apr 2018