A 5-year winter Bald Eagle survey was conducted along 22 km of the Snake River Canyon in northwestern Wyoming. Surveys were done on 94 days requiring 1,414 hrs and 1,888 km driving. In all, 220 (85 percent adults) Bald Eagles were seen. Seventy-seven percent of all eagles were perching, 15 percent were flying, 4 percent were feeding on road-killed mule deer, and 4 percent were flying low over water. Perching sites were identified as 32 percent cottonwoods, 30 percent spruce, 17 percent Douglas-fir, and 22 percent other. Eagles were somewhat clumped in distribution.
Korhel, Art H. and Clark, Tim W.
"Bald Eagle winter survey in the Snake River Canyon, Wyoming,"
Great Basin Naturalist: Vol. 41
, Article 13.
Available at: http://scholarsarchive.byu.edu/gbn/vol41/iss4/13