Alan Murphy/ BIA / Bufflehead (Bucephala albeola) male flying, Alaska

Alan Murphy/ BIA / Bufflehead (Bucephala albeola) male flying, Alaska

Connor Stefanison / Bufflehead duck (Bucephala albeola) male swimming along Lost Lagoon, Stanley Park, Vancouver, British Columbia, Canada. February.

Steve Gettle / Bufflehead (Bucephala albeola) male, North Dakota

Charlie Summers / Bufflehead (Bucephala albeola) male and female in a drainage canal, Bosque del Apache, New Mexico, December.

Charlie Summers / The tail of a drake Bufflehead duck (Bucephala albeola) is fanned as it dives in a Bosque del Apache, New Mexico drainage canal.

Charlie Summers / Male Bufflehead Duck (Bucephala albeola) portrait. Taken at Bosque del Apache, New Mexico, December.

Jan Wegener / Bufflehead (Bucephala albeola) drake, Vancouver, Canada

Glenn Bartley / Bufflehead (Bucephala albeola) male flying, British Columbia, Canada

Matthew Studebaker / Bufflehead (Bucephala albeola) female, Ontario, Canada

Steve Gettle / Bufflehead (Bucephala albeola) male in breeding plumage, Saginaw Bay, Michigan

Steve Gettle / Bufflehead (Bucephala albeola) male swimming, Island Lake Recreation Area, Michigan

Steve Gettle / Bufflehead (Bucephala albeola) male flying, Island Lake Recreation Area, Michigan. Sequence 1 of 2

Steve Gettle / Bufflehead (Bucephala albeola) male flying, Island Lake Recreation Area, Michigan. Sequence 2 of 2

Steve Gettle / Bufflehead (Bucephala albeola) male flying, Kensington Metropark, Milford, Michigan

Donald M. Jones / Bufflehead (Bucephala albeola) male, western Montana

Donald M. Jones / Bufflehead (Bucephala albeola) male, western Montana

Donald M. Jones / Bufflehead (Bucephala albeola) male landing on a small lake, western Montana

Donald M. Jones / Bufflehead (Bucephala albeola) male landing on a small lake, western Montana

Donald M. Jones / Bufflehead (Bucephala albeola) male on lake, western Montana

Donald M. Jones / Bufflehead (Bucephala albeola) male flying over a small lake, western Montana

Rod Williams / Bufflehead (Bucephala albeola) male, captive, from Alaska, Canada, NW USA

Michael Quinton / Bufflehead (Bucephala albeola) female leaving nest cavity with eggs, Slana, Alaska

David Kjaer / Bufflehead (Bucephala albeola) drake or male, native to North America

Tom Vezo / Bufflehead (Bucephala albeola) female swimming in shallows, Texas

Tom Vezo / Bufflehead (Bucephala albeola) females feeding underwater, San Diego Zoo, California

Tom Vezo / Bufflehead duck {Bucephala albeola} on water Long Island, NY, USA.

Tom Vezo / Bufflehead duck (Bucephala albeola) male swimming on water, Colorado, USA

Tim Fitzharris / Bufflehead (Bucephala albeola) male on water, North America

Michael Quinton / Bufflehead (Bucephala albeola) chick at nest entrance in tree, boreal pond habitat, Alaska

Michael Quinton / Bufflehead (Bucephala albeola) mother flying to nest entrance, boreal pond habitat, Alaska

Michael Quinton / Bufflehead (Bucephala albeola) chicks in nest in tree trunk with mother at nest entrance, boreal pond habitat, Alaska

Tim Zurowski/ BIA / Bufflehead (Bucephala albeola) female, Canada

Tim Zurowski/ BIA / Bufflehead (Bucephala albeola) male, Canada

Tom Vezo / Bufflehead (Bucephala albeola) male, San Diego Zoo, California

Tom Vezo / Bufflehead male {Bucephala albeola} California USA Bolsa Chica reserve

Tom Vezo / Bufflehead male {Bucephala albeola} California USA Bolsa Chica reserve

Marie Read / Buffleheads (Bucephala albeola), courtship flight in which several males chase a female (fourth from left) at high speed through the air, early spring, Aurora, New York, USA. Digitally manipulated rig...

John Chan / Flock of Brent geese (Branta bernicla) feeding on Eelgrass (Zostera marina) in a tidal basin, with a Bufflehead (Bucephala albeola) foraging in background, Bolsa Chica Ecological Reserve, Southern Cal...

John Chan / Flock of Brent geese (Branta bernicla) feeding on Eelgrass (Zostera marina) in a tidal basin, with a Bufflehead (Bucephala albeola) foraging in background, Bolsa Chica Ecological Reserve, Southern Cal...