Dave Bevan / Male Great spotted woodpecker (Dendrocopos major) descending down a wooden electricity pole, Carmarthenshire, Wales, UK, June.

Dave Bevan / Elephant hawk-moth (Deilephila elpenor) caterpiller climbing down a Fuchsia (Fuchsia) plant, Carmarthenshire, Wales, UK, September.

Pascal Kobeh / Group of Short-finned pilot whales (Globicephala macrorhynchus) swimming down into deep water, Costa Rica. Pacific ocean.

Radomir Jakubowski / Alpine ibex (Capra ibex) male on mountainside at sunrise, Bernese Alps, Switzerland, July. Received honourable mention in the Big Picture Competition awards 2014. Nominated in the Melvita Nature Image...

Kirkendall-Spring / Snowboarder descending Table Mountain in the Heather Meadows Recreation Area, Washington, USA. March 2013.

Alex Mustard / Diver explores the cathedral at Silfra Canyon, deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates, at Thingvellir National Park, Iceland. May 2011....

Alex Mustard / A diver explores Nikulasargj Canyona deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this ph...

Markus Varesvuo,Markus Varesvuo / Pair of Common ravens (Corvus corax) displaying, Vardo, Norway, March.

Orsolya Haarberg,Orsolya Haarberg / Muskox (Ovibus moschatus) herd, in the Dovrefjell-Sunndalsfjella National Park, Norway. February

Alex Mustard / Big fin reef squid (Sepioteuthis lessoniana) descends from open water to the reef at night. Arafur Sea, Triton Bay, West Papua, Indonesia.

Andrew Parkinson / Coot (Fulica atra) silhouetted as it descends a grass bank, Derbyshire, UK, March. Highly commended in the Portfolio category of the BWPA Competition 2016.

Floris van Breugel / Twilight descends on photographer's mountain camp with light inside tent, in Oregons highest mountain forest on Drake Peak at 8,500 feet. Oregon, USA, January 2010.