Broad classification divisions are based on skeletal and other internal structures. Finer divisions are decided on plumage type and patterns, including those of the downy young, and on behavioral features such as displays associated with pair formation and maintenance.
MallardMallard (Anas platyrhynchos).[Credits : © Index Open]
Common-or-northern-pintailCommon, or northern, pintail (Anas acuta).[Credits : © Lawrence E. Naylor, The National Audubon Society Collection/Photo Researchers]
Mandarin-duck-an-Asian-perching-duckMandarin duck (Aix galericulata), an Asian perching duck.[Credits : © Gordon Langsbury/Bruce Coleman Inc.]
Canada-gooseCanada goose (Branta canadensis).[Credits : Leonard Lee Rue III]
Canada-gooseCanada goose (Branta canadensis).[Credits : © Getty Images]
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