Danny Green / Coastal brown bears (Ursus arctos) resting, Lake Clarke National Park, Alaska, September

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Richard Du Toit / Burchell's Zebra (Equus burchellii) pair nuzzling, Rietvlei Nature Reserve, South Africa

Massimiliano Magnante/ BIA / White Tern (Gygis alba) pair, Bird Island, Seychelles

Tony Wu / Swimmer stroking 'Scar', a male Sperm whale (Physeter macrocephalus) who often seems to seek out and enjoy contact with people. Caribbean, January 2010. Model released.

Jane Burton / British Shorthair kittens, Benedict, ginger, and Joan, silver tabby.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) female grooming a domestic dog. Jodhpur, Rajasthan, India. March.

Fiona Rogers / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) female grooming a domestic dog. Jodhpur, Rajasthan, India. March.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) females hugging to reinforce rank. Jodhpur, Rajasthan, India. March.

Mark Taylor / Tabby cats, Picasso and Smudge, age 3 months, together. Smudge with his paws up on Picasso.

Wim van den Heever / Julia heleconia (Dryas julia) butterfly on head of Yacare caiman (Caiman yacare) Pantanal, Brazil.

Ben Hall / Marine Iguana (Amblyrhynchus cristatus) on rock with lava lizard sitting on its head, Galapagos Islands, May.