. . . . . . . "1959-06-01T00:00:00Z"^^ . . "Lagopus muta" . . "Empetrum nigrum" . . "Weeden, R.B. 1969. Foods of rock and willow ptarmigan in central Alaska with comments on interspecific competition. Auk 86:271-281." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .