John Chan / Elegant tern (Thalasseus elegans) with a broken wing, attempting to take off, Southern California, USA, April.

John Chan / Western gulls (Larus occidentalis) attacking an Elegant tern (Thalasseus elegans) with a broken wing, Southern California, USA, April.

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Steve Downer / Grove snail / brown lipped snail (Cepaea nemoralis) with juvenile riding on its back, Birmingham UK June.

SCOTLAND: The Big Picture / A family of otters rest on the intertidal seaweed. European river otter (Lutra lutra) Shetland, Scotland, UK, July.

Sven Zacek / Broken ice covered in snow at sunset, on the shore of Lake Vortsjarv, gathered to shore by extreme winds, Estonia. December 2014.

Erlend Haarberg / Three-toed woodpecker (Picoides tridactylus) on tree trunk, Sarek National Park, Laponia World Heritage Site, Lapland, Sweden, September.

Denis-Huot / African elephant (Loxodonta africana) male covered with mud at a water hole, Tsavo East National Park, Kenya. August.

Olga Kamenskaya / Vehicles parked on ice on the surface of Lake Baikal, Siberia, Russia, March 2008.

Ben Cranke / Black-striped capuchin (Sapajus libidinosus) using rock as a tool to break open palm nut, Parnaiba Headwaters National Park, Piaui, Brazil. August.

Ben Cranke / Black-striped capuchin (Sapajus libidinosus) using rock as a tool to break open palm nut Parnaiba Headwaters National Park, Piaui, Brazil. July.

Phil Savoie / Point-to-Point horse racing, low angle view of racehorses jumping fence, Monmouthshire, Wales, UK. March 2014.

Phil Savoie / Point-to-Point horse racing, low angle view of racehorses jumping fence, Monmouthshire, Wales, UK. March 2014.

Kristel Richard / Portrait of a traditionally dressed estancia owner mounted on his stallion, during the Festa do Colete Encarnado (Red Waistcoat Festival), a bull running festival, in Vila Franca de Xira, District of...

Ernie Janes / Household Cavalry exercising their horses on Holkham Beach, Norfolk, UK, July 2008

Kristel Richard / A Khampa warrior leads his Tibetan horse towards the start of the race, during the horse festival, near Huangyan, in the Garze Tibetan Autonomous Prefecture in the Sichuan Province, China, June 2010

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Kristel Richard / Two riders on horses (Equus caballus) from the Gremio di Falegnamii, dressed in traditional costume, parade before the start of the Sartiglia (race to the star) in Oristano, Sardinia, Italy. February...

Kristel Richard / Portrait of a masked rider on a horse (Equus caballus) from the Gremio di Falegnami parades before the start of the 'Sartiglia' (race to the star) in Oristano, Sardinia, Italy. February 2010

Kristel Richard / Head portrait of a rare grey Yorkshire Dales gelding (Equus caballus) with long mane, at Glanusk Estate, Wales, UK

Jerry Monkman / Man walking with his climbing gear at Lower Slab in Pawtuckaway State Park, New Hampshire, USA, September 2008. Model released.

Michael Hutchinson / Llama (Lama glama), Los Glaciares National Park, Argentina