Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years spinning in circles, Bossou Forest, Mont Nimba, Guinea. January 2011.

Diane McAllister / Black necked stilt (Himantopus mexicanus) standing with one leg raised near its nest site in Carson Lake Wetlands. Fallon, Nevada, USA, July

Bernard Castelein / Red wattled lapwing {Vanellus duvaucelii / indicus}grooming with leg raised, India

Rolf Nussbaumer / Moorhen (Gallinula chloropus) in water with one leg raised, Welder Wildlife Refuge, Sinton, Texas, USA. May 2005

Andrew Parkinson / Chacma baboon juvenile sitting with leg raised {Papio ursinus} Chobe NP, Botswana

Premaphotos / Great green bush cricket (Tettigonia viridissima) male in calling position with leg raised for stridulation, UK