Sixty-four cougar (Felis concolor) stomachs and 41 intestinal tracts were examined for food items in northeastern Oregon from 1976 through 1979. Food items, in order of decreasing frequency, were mule deer (Odocoileus hemionus), North American elk (Cervus elaphus), porcupine (Erethizon dorsatum), snowshoe hare (Lepus americanus), and deer mouse (Peromyscus maniculatus).
Maser, Chris and Rohweder, Ronald S.
"Winter food habits of cougars from northeastern Oregon,"
Great Basin Naturalist: Vol. 43
, Article 7.
Available at: https://scholarsarchive.byu.edu/gbn/vol43/iss3/7