National Geographic : 1946 Jul
(U 2National ueograpmic society nauacnriroue uy Aiireu iu. isaiey With Fluttering Wings, Mother Ptarmigan Attempts to Decoy Human Intruders from Her Hidden Brood High-ranging Colorado birds, the white-tailed ptarmigan are well equipped for mountain life. Feathered feet support them on snow, and inwhite winter dress they are almost invisible when motionless. In summer their dark plumage blends with lichen-covered boulders.