. . . . . . . "1999-01-01T00:00:00Z"^^ . . "Anser cygnoides" . . "Potamogeton nodosus" . . "Zhang, J. and J. Lu. 1999. Feeding ecology of two wintering geese species at Poyang Lake, China. Journal of Freshwater Ecology 14:439-445." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .