Smithsonian Institution
National Museum of Natural History: Ptarmigan
This Smithsonian website has a brief, but thorough, article on the Ptarmigan. It also includes pictures and an extensive quote from 19th Century naturalist Edward Nelson.
PBS
Nh Pbs: Nature Works: Rock Ptarmigan
Discover how the Rock Ptarmigan lives in the Tundra when you check out this site. This resource features photographs, information on characteristics, life cycle and more.