. . . . . . . . . "1908-01-01T00:00:00Z"^^ . . "Pheucticus ludovicianus" . . "Pisum sativum" . . "Mcatee, W. L. 1908. Food habits of the grosbeaks. U.S. Department of Agriculture Biological Survey, Bulletin No. 32. Washington, D.C." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .