Anatidae

online document, Canadian Wildlife Service Hinterland Who's Who Series

online article, Journal of Wildlife Management 60 (2) 1996

USGS Northern Prairie Wildlife Research Center

downloadable article, Waterfowl 2002 12 (2) 1999

a conservation partnership under the North American Waterfowl Management Plan (site includes species fact sheets)

dedicated to the survival of the ducks of the tribe Mergini

a US private, non-profit organization dedicated to assuring the vitality and welfare of wild Trumpeter Swan populations, and to restoring the species to as much of its former range as possible