. . . . . . . "2001-04-01T00:00:00Z"^^ . . "Cygnus olor" . . "Macoma" . . "Perry, M.C., P.C. Osenton, and E.J.R. Lohnes. 2004. Food habits of mute swans in Chesapeake Bay. In Mute Swans and their Chesapeake Bay Habitats: Proceedings of a Symposium: US Geological Survey, Biological Resources Discipline Information and Technology Report USGS/BRD/ITR-2004-0005 (ed MC Perry), pp. 31-36." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .