Marie Read / Black-necked stilts (Himantopus mexicanus) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers...

Dan Burton / Reindeer (Rangifer tarandus) in enclosure, Lapland, Sweden, November 2009

Marie Read / American avocet (Recurvirostra americana) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers,...

Roland Seitre / Herdsmen with their cattle, and a park ranger, in front of traditional dwellings. Ishaqbini Reserve, Kenya, 2009.

Martin Dohrn / Lioness (Panthera leo) growling at hers and her sister's unruly cubs as they try to persuade their mother to take them hunting. Masai Mara, Kenya. Image taken at night using thermal camera technology...

David Shale / Deep sea Anglerfish female with parasitic male attached to belly - stomach visible through mouth due to pressure change at surface where photographed. Male is x10 smaller than female and lives permane...

Neil Aldridge / African lion (Panthera leo) cub walks over to its mother, who is lying down, and rubs its head against hers. The cub sits down next to its mother and then walks out of the frame. Okavango Delta, Botsw...