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21,203 species in Colorado
Mareca americana
Anas crecca
Pelecanus erythrorhynchos
Contopus sordidulus
Bucephala clangula
Spinus psaltria
Aphelocoma woodhouseii
Mergus merganser
Molothrus ater
Eremophila alpestris
Tachycineta bicolor
Bucephala albeola
Icterus bullockii
Petrochelidon pyrrhonota
Sitta pygmaea
Sialia currucoides
Aythya collaris
Podilymbus podiceps
Myadestes townsendi
Aechmophorus occidentalis
Buteo swainsoni
Lophodytes cucullatus
Branta hutchinsii
Piranga ludoviciana
Aythya affinis
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