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21,203 species in Colorado
Psaltriparus minimus
Corthylio calendula
Circus hudsonius
Pandion haliaetus
Spatula discors
Oxyura jamaicensis
Aythya americana
Vireo gilvus
Chondestes grammacus
Pooecetes gramineus
Actitis macularius
Pheucticus melanocephalus
Bubo virginianus
Euphagus cyanocephalus
Cardellina pusilla
Dumetella carolinensis
Bombycilla cedrorum
Spatula cyanoptera
Melospiza lincolnii
Egretta thula
Archilochus alexandri
Pipilo chlorurus
Geothlypis trichas
Recurvirostra americana
Empidonax difficilis
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