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21,203 species in Colorado
Catharus ustulatus
Leiothlypis virginiae
Cistothorus palustris
Toxostoma rufum
Oreoscoptes montanus
Calidris minutilla
Empidonax oberholseri
Perisoreus canadensis
Anser caerulescens
Calidris bairdii
Catherpes mexicanus
Rallus limicola
Limnodromus scolopaceus
Spizella pallida
Riparia riparia
Phasianus colchicus
Melanerpes lewis
Athene cunicularia
Mergus serrator
Buteo lagopus
Gymnorhinus cyanocephalus
Ardea alba
Gavia immer
Porzana carolina
Myiarchus cinerascens
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