Marie Read / Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October.

Sue Daly / Close up of a Plaice (Pleuronectes platessa), swims away, Sark, British Channel Islands, UK, June.

Ingo Arndt / Close up of foot of Hen harrier {Circus cyaneus}

Ingo Arndt / Close up of foot of Hen harrier {Circus cyaneus}

Markus Varesvuo / Male Hazel grouse (Tetrastes / Bonasa bonasia) portrait, Kuusamo, Finland, June.

Donald M. Jones / Mallard (Anas platyrhynchos) hen, central Montana

Gerrit Vyn / Greater sage-grouse (Centrocercus urophasianus) male displaying on a lek in snow, Sublette County, Wyoming, USA. April.

Ole Jorgen Liodden / Tasmanian native hen (Gallinula mortierii) walking through grass, Bruny Island, Tasmania, Australia. Endemic.

Alan Murphy / Northern Harrier (Circus cyaneus) female flying, Texas

Markus Varesvuo / Black grouse (lyrurus tetrix) female and chick at nest, Vaala, Finland, June.

Markus Varesvuo / Hen Harrier (Circus cyaneus) flying, Liminka Finland July

Markus Varesvuo / Hen Harrier (Circus cyaneus) flying, Liminka Finland July