Anderson, Alun; After the Ice: Life, Death, and Geopolitics in the New Arctic; Smithsonian Insitution, Washington, 2009

Ellis, Richard;  On Thin Ice: The Changing World of the Polar Bear; Knopf, New York, 2009

Grange, WB; Those Of The Forest; Willow Creek Press, Minocqua, WI, 1990

Levy, Sharon; Once & Future Giants: What Ice Age Extinctions Tell Us About The Fate Of Earth’s Largest Animals; Oxford University Press, New York, 2011

Theberge, John and Theberge, M; The Ptarmigan’s Dilemma: An Exploration Into How Life Organizes And Supports Itself;  McClelland and Stewart, Toronto, 2010