A detailed comparison of many aspects of the two polar regions. Includes physical features, seasons, weather, types of ice, plants and animals, human population, and climate change.

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.

This Smithsonian website has a brief, but thorough, article on the Snowy Owl that also includes a picture and an extensive quote from the 19th Century naturalist Edward Nelson.