. . . . . . . . . "1969-05-01T00:00:00Z"^^ . . "Calcarius lapponicus" . . "Cerastium" . . "Custer, T. W. and F. A. Pitelka. 1978. Seasonal trends in summer diet of the Lapland Longspur near Barrow, Alaska. Condor 80:295-301." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .