Ann & Steve Toon / Impala (Aepyceros melampus) allo-grooming, iMfolozi game reserve, KwaZulu-Natal, South Africa, August

Guy Edwardes / Red-billed oxpecker (Buphagus erythrorhynchus) feeding on Impala (Aepyceros melampus), Savuti, Botswana.

Ann & Steve Toon / Impala (Aepyceros melampus) with redbilled oxpecker (Buphagus erythrorhynchus), Kruger National Park, South Africa.

Gerrit Vyn / Black-faced Spoonbills (Platalea minor). Incheon, South Korea. October. Critically endangered.

Neil Aldridge / Two Impalas (Aepyceros melampus) ewes grooming each other in evening light on South Africa's Kruger National Park.

Chris & Monique Fallows / Impala (Aepyceros melampus) herd at dawn, Mana Pools National Park, Zimbabwe, October.

Niall Benvie / Black faced sheep ram with twisted horns, Mull, Scotland, UK. January.

Wim van den Heever / Bare-faced curassow (Crax fasciolata) portrait of female, Pantanal, Brazil.

Thomas Marent / Black-faced Spider Monkey (Ateles chamek) juvenile calling, Tambopata-Candamo Nature Reserve, Peru

Thomas Marent / Black-faced Lion Tamarin (Leontopithecus caissara), Superagui National Park, Atlantic Forest, Brazil

Tony Heald / Hanuman langur (Semnopithecus entellus) eating coconut husk, Bandhavgarh National Park, India. March.

Mark Bowler / Black spider monkey (Ateles chamek) calling, captive, Peru.