. . . . . . . "1969-01-01T00:00:00Z"^^ . . "Cygnus olor" . . "Alopecurus geniculatus" . . "Owen, M. and C.J. Cadbury. 1975. The ecology and mortality of swans at the Ouse Washes, England. Wildfowl 26:31-42." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .