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

Terry Whittaker / Arctic fox (Vulpes lagopus). Blue colour morph. Hornstrandir Nature Reserve, Iceland. March

Nick Garbutt / Pack of wolves (Canis lupus). Yellowstone National Park, Wyoming, USA. January.

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.

Terry Whittaker / Arctic fox (Vulpes lagopus) feeding in snow, blue colour morph, Hornstrandir Nature Reserve, Iceland, March.

Terry Whittaker / Arctic fox (Vulpes lagopus) feeding and digging in snow whilst hunting, blue colour morph, Hornstrandir Nature Reserve, Iceland, March.

Giri Cavale / Melanistic leopard / Black panther (Panthera pardus) on territorial patrol on track, Nagarahole National Park, Nilgiri Biosphere Reserve, Karnataka, India.

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

MYN / JP Lawrence / Strawberry poison frog (Oophaga pumilio) Escudo de Veraguas, Panama. Meetyourneighbours.net project

MYN / JP Lawrence / Dyeing poison frog (Dendrobates tinctorius) captive, occurs in Guiana, Suriname, Brazil, and French Guiana. Meetyourneighbours.net project