Number of species recorded: 472 (ABA), 462 (NIB)
ABA=All birds considered countable by the ABA and appearing on the official state list published by the CBRC.
NIB=Only birds appearing on the official CBRC state list excluding the 11 introduced species (No Introduced Birds).
Top Big Years
311 2015 Julie Szabo
306 1990 Bob McKernan
302 2016 Julie Szabo
301 2011 Howard King
Top Big Days
199 26 Apr 2003 Todd Easterla, Steve Rovell, John Sterling, Scott Terrill
174 29 Apr 1990 Ed LaRue, Chet McGaugh, Bob McKernan, Steve Myers
166 28 Apr 2001 Dave Goodward, Sandy Koonce, Chet McGaugh
161 18 Apr 2015 David Rankin, Ninad Thakoor
153 29 Apr 1990 Andrew Howe, Vernon Howe
Top Ten Birds (by Howard King)
1. Common Swift, 30 Oct 2013, near Desert Center
This certainly wasn't on anyone's list of expected birds. Another one anywhere in North America would be amazing
2. Common Snipe, 11 Dec 2011, San Jacinto Wildlife Area
The difficulty of identification plus this bird’s rarity makes a follow up appearance unlikely. Having the two rarest birds being "Common" was too good to pass up.
3. Marsh Sandpiper, 26 Oct 2013, Mecca
If not for an additional sighting of this species in the state, this would have been in the top two.
4. Wedge-tailed Shearwater, 31 Jul 1988, Salton Sea (Whitewater)
Another record unlikely to be repeated, and with access to the Whitewater River Delta being as it is, no one is likely to be there if another ever shows.
5. Spotted Redshank, 30 Apr-6 May 1983, Salton Sea (Whitewater)
All state records occurred in a six year period 1983-1989. Apparently it’s in bad shape on its nesting areas.
6. American Oystercatcher, 20-30 Aug 1977, Salton Sea (Salt Creek)
This singular inland record seems doubtful to be repeated.
7. Garganey, 21 Mar-4 Apr 1979, Lake Elsinore
The Asian population has apparently plummeted. Another one may never occur.
8. Buller's Shearwater, 6 Aug 1966, Salton Sea (Whitewater)
Another remarkable record at the Whitewater River Delta. Again lack of access renders its detection unlikely if it ever occurs again.
9. Great Black-backed Gull, 1-5 May 2013, Salton Sea
First state record but seems likely to reoccur as they have become fairly regular into Colorado.
10. Gyrfalcon, 15 Jan-9 Mar 2012, San Jacinto Wildlife Area
When told about the discovery of a huge falcon this species never crossed my mind. I wouldn't hold out much hope for a second one.
Bonus: Purple Gallinule