Hermann Brehm / Snow Leopard (Panthera uncia) climbing steep rock face, Mongolia

Dave Bevan / Male Blackbird (Turdus merula) catching European eel (Anguilla anguilla) elvers as they migrate up a waterfall, Ceredigion, Wales, UK, July.

Dave Bevan / Male Blackbird (Turdus merula) catching European eel (Anguilla anguilla) elvers as they migrate up a waterfall, Ceredigion, Wales, UK, July.

Dave Bevan / European eel (Anguilla anguilla) elvers migrating up a wet rock next to a waterfall, Ceredigion, Wales, UK, July.

Jack Dykinga / Eroded Chinle shale mounds with colour bands, beneath the Paria Plateau, Vermilion Cliffs National Monument, Paria Canyon Vermilion, Arizona, USA.

Philippe Clement / Three male Alpine ibex (Capra ibex) climbing up a steep mountain rock face, one pushes another one away, Gran Paradiso National Park, Graian Alps, Italy, June.

Philippe Clement / Two male Alpine ibex (Capra ibex) fighting on a steep mountain rock face, Gran Paradiso National Park, Graian Alps, Italy, June.

Yva Momatiuk & John Eastcott / Climber climbing rock, Indian Creek, Utah

Wim van den Heever / Snow Leopard (Panthera uncia) climbing up mountain slope, Hemis National Park, India, February.

Pete Oxford / Marine iguana (Amblyrhynchus cristatus) underwater. Fernandina Island. Galapagos, Endemic Species.

Mark Hamblin / 2020VISION / Climbers on ascent of Cairn Lochan in winter, Cairngorms National Park, Highlands, Scotland, UK, January 2011

Axel Gomille / Sloth Bear (Melursus ursinus) climbing on tree. Karnataka, India, March.