1997. American Birding Association. Colorado has a wonderful diversity of birds, offering exciting specialties and serendipitous finds to birders from every part of the continent. Most people associate Colorado with its Rocky Mountains - easily accessible right up to the tundra in every season of the year. Winter-plumaged White-tailed Ptarmigan, the same color as snow - as shown in the author's cover photograph from Guanella Pass - is high on any birder's wish list, but on the way up to see it, you will also find the three species of rosy-finch and an excellent variety of jays, woodpeckers, and winter finches. The Rockies is but one of the bird habitats for which Colorado is well known. The Eastern Plains, at their best on Pawnee National Grassland, offer such breeding specialties as Mountain Plover and McCown's and Chestnut-collared Longspurs. In April you may watch Greater and Lesser Prairie-Chickens on their strutting grounds. The Western Plateaus and Valleys, which comprise the western third of Colorado, have their own specialties - Sage and Sharp-tailed Grouse, Chukar Gray Vireo, Black-throated and Crace's Warblers, and many more.