Andy Rouse / Grizzly Bear (Ursus arctos horribilis) walking through a river with caught salmon against a mountainous landscape as two gulls fly past. Katmai, Alaska, USA, August.

Andy Rouse / Grizzly Bear (Ursus arctos horribilis) with caught salmon, another bear more distant, with mountains backing the scene. Katmai, Alaska, USA, August.

Claudio Contreras / Jumping cholla (Cylindropuntia fulgida) cactus branches hanging down, view of Sonoran Desert and Montezuma's Head Mountain and the Ajo Range. Organ Pipe Cactus National Monument, Arizona, USA. Jan...

Nick Garbutt / Sheep / domestic stock pen covered with chain-mail to protect against attack from Snow leopards (Panthera uncia). This has cut predation of domestic animals by 90%. Ulley Valley, Himalayas, Ladakh, no...

Nick Garbutt / Sheep / domestic stock pen covered with chain-mail to protect against attacks from snow leopards (Panthera uncia). This has cut predation of domestic animals by 90%. Ulley Valley, Himalayas, Ladakh, n...

Ashley Cooper / Looking down from Moro Rock at sunset, Sequoia National Park California, USA, October 2014.

Ashley Cooper / Mountains above Fortuna bay, South Georgia, southern Ocean. February 2014

Ashley Cooper / Rugged mountainous scenery in Drygalski fjord on the South East tip of South Georgia, Southern Ocean. February 2014

Ashley Cooper / Brown skua (Stercorarius antarcticus) on the beach on Prion Island, South Georgia, Southern Ocean.

Pete Oxford / Mount Roraima is the highest of the Pakaraima chain of Tepuis plateaus in South America, Pakarajma Mountains, near Phillipai, West Guyana, South America

Pete Oxford / Mount Roraima tepui (flat top mountain) is the highest of the Pakaraima chain of Tepuis plateaus in South America, Pakarajma Mountains, near Phillipai, West Guyana, South America

Tim Fitzharris / Endless Chain Ridge, Honeymoon Lake, Jasper National Park, Alberta, Canada