. . . . . . . "1970-07-01T00:00:00Z"^^ . . "Aythya americana" . . "Tracheophyta" . . "Bergman, R.D. 1973. Use of southern boreal lakes by postbreeding canvasbacks and redheads. Journal of Wildlife Management 37:160-170." . . . . "Allen Hurlbert. 2017. Avian Diet Database." .