Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) juvenile exercising / strengthening wings, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, September

Tony Heald / Wandering albatross (Diomedea exulans), chick exercising wings on nest. Prion Island, South Georgia, October.

Tony Heald / Wandering albatross (Diomedea exulans), chick exercising wings on nest. Prion Island, Bay of Isles, South Georgia. October.

Markus Varesvuo / Peregrine falcon (Falco peregrinus) fledglings exercising wings, Vaala, Finland, July.

Markus Varesvuo / Peregrine falcon (Falco peregrinus) fledgling exercising wings, Vaala, Finland, July.

Markus Varesvuo / Peregrine falcon (Falco peregrinus) fledglings exercising wings, Vaala, Finland, July.

Dave Bevan / Juvenile Swallows (Hirundo rustica) exercising wings whilst perched on a rope in a barn, Carmarthenshire, Wales, UK, September.

Andres M. Dominguez / Two juvenile Peregrine falcons (Falco peregrinus) one exercising its wings, Andalusia, Spain, May

Dave Bevan / Flock of Turnstones (Arenaria interpres) feeding on a sea wall, disturbed by a runner, Devon, England, UK, January

Philippe Clement / Fallow deer (Dama dama) buck running over path, with Sika deer (Cervus nippon) fighting nearby and joggers and walkers passing on a footpath, Jaegersborg Dyrehaven, Denmark, October.

Philippe Clement / Sika deer (Cervus nippon) standing next to path, with joggers and walkers looking as they pass, Jaegersborg Dyrehaven, Denmark, October.

Matthew Maran / Runner on sunlit path in early morning, cose to the Vale of Health Hampstead Heath, London, England, UK. November 2015.