National Geographic : 1936 Oct
HUNTED BIRDS OF FIELD AND WILDS U) INational iueograpnic society CHAMELEONLIKE, PTARMIGAN SUIT THEIR DRESS TO THE BACKGROUND The two WILLOW PTARMIGAN on the ground at the left (male above, his mate below) are flecked with white to merge with a sparsely snow-strewn autumn landscape. Spring decks the males (on the wing and on the rock) in striking finery, but protects the mother bird with sober plumage. In winter they all match the snow (Plate XIII). These ptarmigan range over the arctic and subarctic regions of the North, migrating southward in winter, casually to the border of the United States. They form an important food supply for northern natives.