Attributes / relations provided by
♦ 1POTAPOV, E. 2011.
Gyrfalcon diet: Spatial and temporal variation In R. T. Watson, T. J. Cade, M. Fuller, G. Hunt, and E. Potapov (Eds.). Gyrfalcons and Ptarmigan in a Changing World. The Peregrine Fund, Boise, Idaho, USA
♦ 2The Sagebrush Sea by
Cornell Lab of Ornithology♦ 3Exploring the Denali Food Web, ParkWise, National Park Service