Danny Green / Polar bear (Ursus maritimus) two walking in snowy landscape with glacier behind. Svalbard, Norway, April 2018.

Robert Valentic / Central bearded dragon (Pogona vitticeps) basking in mallee / heathland habitat on the Murrayville Track in the Big Desert Wilderness of north-western Victoria, Australia.

Will Burrard-Lucas / Young male melanistic leopard (Panthera pardus), Laikipia Wilderness Camp, Kenya. Photographed with a camera trap. EDITORIAL USE ONLY. All other uses require clearance

Will Burrard-Lucas / Young male melanistic leopard (Panthera pardus), Laikipia Wilderness Camp, Kenya. Photographed with a camera trap. EDITORIAL USE ONLY. All other uses require clearance

Will Burrard-Lucas / Young male melanistic leopard (Panthera pardus), Laikipia Wilderness Camp, Kenya. Photographed with a camera trap. EDITORIAL USE ONLY. All other uses require clearance

Will Burrard-Lucas / Young male melanistic leopard (Panthera pardus), Laikipia Wilderness Camp, Kenya. Photographed with a camera trap.

Yva Momatiuk & John Eastcott / Canoe on river in summer, Hudson River, Hudson Gorge Wilderness, New York

Sergey Gorshkov / Moonrise at twilight, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Sergey Gorshkov / Sunset over Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia, October.

Kirkendall-Spring Photographers / Vicky Spring next to a small tarn, Lyman Lakes Basin, Glacier Peak Wilderness, Wenatchee National Forest, Washington, USA, September 2014. Model released.

Jack Dykinga / Twisted Saguaro cactus (Carnegiea gigantea) with the Milky Way and distant glow of Phoenix lights, Sonoran Desert National Monument, South Maricopa Mountains Wilderness, Arizona, USA. September 2017.

Jack Dykinga / ARCHIVED SG - Duplicate 10/10/2017. Saguaro cactus (Carnegiea gigantea) at sunset, with drooping frost damaged limbs, South Maricopa Mountains Wilderness, Sonoran Desert National Monument, Arizona...