Danny Green / Bison (Bison bison) herd walking in line in snow, Yellowstone National Park, Wyoming, USA, February

Inaki Relanzon / Gentoo penguins (Pygoscelis papua) on the beach at sunset, Sea Lion Island, Falkland Islands.

Jack Dykinga / Whipple Mountain foothills, with flowering Notch-leaf scorpion-weed (Phacelia crenulata) and Heartleaf evening primrose (Camissonia cardiophylla) with the Riverside and Big Maria Mountains in the back...

Ann & Steve Toon / Cape buffalo (Syncerus caffer) drinking at waterhole at night, Zimanga private game reserve, KwaZulu-Natal, South Africa, September

Ann & Steve Toon / Plains zebra (Equus quagga) drinking at waterhole at night, Zimanga private game reserve, KwaZulu-Natal, South Africa, September

Pal Hermansen / Fulmar (Fulmarus glacialis) flying with reflection on sea, Iceland, July.

Pal Hermansen / Brunnich's guillemot (Uria lomvia) taking off from water, Alkefjellet. Svalbard, Norway, July.

Jack Dykinga / Sandhill crane (Grus canadensis) running to take off into flight, Boque del Apache, New Mexico, USA, December.

Jack Dykinga / Snow geese (Chen caerulescens) in flight in front of super moon, Bosque del Apache National Wildlife Refuge, New Mexico, USA, December.

Ingo Arndt / Land snail / Brown-lipped snail (Cepaea nemoralis) crawling over a razor blade. The constantly produced mucus is a protection shield between the sole of the snail and the razor blade whilst the snail...

Ingo Arndt / Land snail (Polymita picta) collection of shells showing variation in patterning, Cuba. Endemic species.

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April