TJ Rich / Portrait of male silverback Western Lowland gorilla {Gorilla gorilla gorilla} with fingers in mouth UK

Ashley Cooper / Woman carrying Rice crops harvested by hand in the Sunderbans, Ganges Delta, India.

Ashley Cooper / Man carrying Rice crop harvested by hand in the Sunderbans, Ganges Delta, India. 2013

Neil Aldridge / Domesticated Red fox (Vulpes vulpes) travels in a car with his head out of the window on his way to being taken for an evening walk by his owner in forests in East London, England. This fox was brough...

Jami Tarris / Japanese Macaque (Macaca fuscata) raising hand, Jigokudani, Nagano, Japan

SCOTLAND: The Big Picture / Scottish wildcat (Felis silvestris grampia) male, view of head for pelage scoring. Inside The Royal Zoological Society Scotland / RZSS mobile vet unit, Strathsprey, Cairngorms National Park, Scotland,...

Thomas Marent / Aruba Rattlesnake (Crotalus durissus) fangs, native to South America

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) male, thrity-six years old, being groomed, Gombe National Park, Tanzania

Sebastian Kennerknecht / Snowy Plover (Charadrius nivosus) biologist, Karine Tokatlian, listening to chick pecking at inside of egg, Eden Landing Ecological Reserve, Union City, Bay Area, California

Nick Turner / Rural blacksmith at work, Cherington Forge, Cherington, Gloucestershire, UK. September 2015.

Pete Oxford / White Rhinoceros (Ceratotherium simum) tooth from poached animal, South Africa

Sebastian Kennerknecht / Mountain Lion (Puma concolor) biologists, Chris Fust and Justine Alyssa Smith, measuring canine teeth of sub-adult male during collaring, Santa Cruz Puma Project, Santa Cruz, Monterey Bay, California