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National Geographic : 1936 Oct
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THE NATIONAL GEOGRAPHIC MAGAZINE (C) National Geographic society PTARMIGAN WEAR WARM "STOCKINGS" OF FEATHERS ON LEGS AND FEET They nest on the ground, and so fully do they trust their protective coloration that they may not stir until almost trampled. The ROCK PTARMIGAN (male and female in fall plumage, above) breeds throughout arctic America and the barren lands of Alaska and Canada. The dapper WHITE-TAILED PTARMIGAN (male and female in summer dress, lower right and left, and young bird in fall plumage in the foreground) is smaller than other ptarmigan and is found in the Rocky Mountains. XII
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