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

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

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

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

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

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

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

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

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

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

Thomas Marent / Black-faced Spider Monkey (Ateles chamek) pair, native to South America

Neil Aldridge / Lappet-faced vulture (Torgos tracheliotos) resting on a dead tree alongside White-backed vultures (Gyps africanus), Kruger National Park, South Africa. Vulnerable species.

Mark Bowler / Black spider monkey (Ateles chamek) sticking tongue out, captive, Peru.

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

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

Dave Watts / Black-faced ibis (Theristicus melanopis) on nest, captive, occurs in South America

Dave Watts / Black-faced ibis (Theristicus melanopis) profile on nest, captive, occurs in South America.

Dave Watts / Black-faced ibis (Theristicus melanopis) profile, captive, occurs in South America.

Dave Watts / Black-faced ibis (Theristicus melanopis) profile, captive, occurs in South America

Cyril Ruoso / Keeper feeding Chamec spider monkey (Ateles chamek) in Ikamaperou Sanctuary, Amazon, Peru. October 2006.

Cyril Ruoso / Chamec spider monkey (Ateles chamek) hanging upside down by tail, Ikamaperou Sanctuary, Amazon, Peru.

Cyril Ruoso / Chamec spider monkey (Ateles chamek) in tree, Ikamaperou Sanctuary, Amazon, Peru.

Richard Du Toit / South African giraffe (Giraffa camelopardalis giraffa), Impala (Aepyceros melampus) and birds including Wooly necked stork (Ciconia episcopus) and Grey heron (Ardea cinerea) at waterhole, Kruger Nati...

Richard Du Toit / Impala (Aepyceros melampus) rams smelling each other, silhouetted at dawn, Itala Game Reserve, KwaZulu-Natal, South Africa.

Richard Du Toit / Tourist using mobile phone to film Impala (Aepyceros melampus) Kruger National Park, South Africa.

Richard Du Toit / Impala (Aepyceros melampus) rams fighting, Chobe National Park, Botswana.

Dong Lei / Black-faced laughingthrush (Garrulax affinis) on branch, Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Nyingchi Prefecture, Tibet, China. November.

Dong Lei / Black-faced Bunting (Emberiza spodocephala sordida) female in tree, Xishuangbanna National Nature Reserve, Yunnan Province, China. March.

Denis-Huot / Cheetah (Acinonyx jubatus) female carrying impala, Masai Mara Game Reserve, Kenya, September.

Denis-Huot / Impala (Aepyceros melampus) males in storm, Masai Mara Game Reserve, Kenya, September.

Denis-Huot / Male impalas (Aepyceros melampus) standing in heavy rain, Masai-Mara Game Reserve, Kenya. February.

Charlie Summers / Two Impala Rams (Aepyceros melampus) testing each other prior to more aggressive in dominance behaviour. Mikumi National Park, Tanzania

Aflo / Lappet face vulture (Torgos tracheliotos) in tree at sunset, Kenya.

Anup Shah / Impala herd at sunrise (Aepyceros melampus). Maasai Mara National Reserve, Kenya.

Anup Shah / Impala (Aepyceros melampus) and Common or Plains zebra mixed herd (Equus quagga burchellii). Maasai Mara National Reserve, Kenya.

Anup Shah / Impala female head portrait (Aepyceros melampus). Maasai Mara National Reserve, Kenya.

Anup Shah / Impala fawn suckling (Aepyceros melampus). Maasai Mara National Reserve, Kenya.

Anup Shah / Impala (Aepyceros melampus) juvenile females standing together. Maasai Mara National Reserve, Kenya.

Anup Shah / Impala (Aepyceros melampus) juvenile females standing together. Maasai Mara National Reserve, Kenya.

Anup Shah / Impala female portrait (Aepyceros melampus). Maasai Mara National Reserve, Kenya.

Juan Carlos Munoz / Masked weaverbird (Ploceus velatus) nests in palm tree, Namaqualand, Northern Cape province, South Africa, September 2012.

Juan Carlos Munoz / Masked weaverbird (Ploceus velatus) nests in palm tree, Namaqualand, Northern Cape province, South Africa, September 2012.

Juan Carlos Munoz / Masked weaverbird (Ploceus velatus) nests in palm tree, Namaqualand, Northern Cape province, South Africa, September 2012.

Fiona Rogers / Black-faced Vervet Monkey (Cercopithecus aethiops) young male playing with his mother's tail, Elsamere, Lake Naivasha, Kenya

Fiona Rogers / Black-faced Vervet Monkey (Cercopithecus aethiops) mother nursing baby, Elsamere, Lake Naivasha, Kenya

Fiona Rogers / Black-faced Vervet Monkey (Cercopithecus aethiops) juvenile in tree, Elsamere, Lake Naivasha, Kenya

Fiona Rogers / Black-faced Vervet Monkey (Cercopithecus aethiops) female resting, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) mother with baby and juvenile, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) mother with baby, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) mother with baby, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) young climbing tree, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) female with one week old baby, Elsamere, Lake Naivasha, Kenya

Anup Shah / Black-faced Vervet Monkey (Cercopithecus aethiops) mother with baby, Elsamere, Lake Naivasha, Kenya

Glenn Bartley / Black-faced Ibis (Theristicus melanopis), Ecuador

Denis-Huot / Two male Cheetahs (Acinonyx jubatus) playing with baby Impala (Aepyceros melampus) prey, Masai-Mara game reserve, Kenya.

Denis-Huot / Male Impalas (Aepyceros melampus) standing in the rain with Wildebeest (Connochaetes taurinus) herd beyond, Masai-Mara game reserve, Kenya.

Denis-Huot / Leopard (Panthera pardus) female with Impala (Aepyceros melampus) prey, Samburu game reserve, Kenya.

Denis-Huot / Leopard (Panthera pardus) male carrying Impala (Aepyceros melampus) prey to tree, Masai-Mara game reserve, Kenya.

Mary McDonald / Young female impalas (Aepyceros melampus) playing, Samburu Game Reserve, Kenya. October.

Mary McDonald / Young female impala (Aepyceros melampus) leaping, Samburu Game Reserve, Kenya. October.

Juan Carlos Munoz / Bare-faced curassow (Crax fasciolata) captive, occurs in South America.

Ann & Steve Toon / Young male impala (Aepyceros melampus) behind acacia bush, Pilanesberg game reserve, North West province, South Africa, February

Anup Shah / Impala (Aepyceros melampus) herd sheltering from the sun.Maasai Mara National Reserve, Kenya. Jan 2012.

Christophe Courteau / Mixed flock of White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis) and Roseate Spoonbill (Ajaia ajaia) taking off the shallow water of Hato El Cedra...

Christophe Courteau / Mixed flock of White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis), Black-necked Stilts (Himantopus mexicanus) taking off the shallow water of Hato...

Denis-Huot / Black-faced ibis (Theristicus melanopis) on the nest, captive at zoo. Occurs in South America

Denis-Huot / Impala (Aepyceros melampus) male in rain storm, Masai Mara Game Reserve, Kenya

Sue Daly / Black faced blenny (Tripterygion delaisi) Guillaumesse, Sark, British Channel Islands.

Sue Daly / Black faced blenny (Tripterygion delaisi) Guillaumesse, Sark, British Channel Islands.

Tony Heald / Lappet-faced vulture (Torgos tracheliotus) pair at the nest. Etosha National Park, Namibia.

Tony Heald / Lappet-faced vulture (Torgos tracheliotus) pair at the nest. Etosha National Park, Namibia.

Will Burrard-Lucas / African elephant bull (Loxodonta africana) feeding in evening light and impala (Aepyceros melampus) in the background, South Luangwa National Park, Zambia. April.

Will Burrard-Lucas / Two male Impala (Aepyceros melampus) fighting, South Luangwa National Park, Zambia. March.

Richard Du Toit / Impala (Aepyceros melampus) feeding on fallen Mopani leaves, Kruger National Park, Limpopo Province, South Africa, October.

Richard Du Toit / Redbilled Quelea (Quelea quelea) massive flock, Kruger National Park, Limpopo Province, South Africa, October.

Loic Poidevin / Female Black faced sandgrouse (Pterocles decoratus) on ground, Samburu, Kenya, October.

Loic Poidevin / Male Black faced Ssndgrouse (Pterocles decoratus) on ground, Samburu, Kenya, October.

Loic Poidevin / Two Lappet faced vultures (torgos tracheliotus) on ground, one with wings held partially open, Samburu, Kenya, October, Vulnerable species.

Loic Poidevin / Two Lappet faced vultures (torgos tracheliotus) on ground, one with wings held partially open, Samburu, Kenya, October, Vulnerable species.

Loic Poidevin / Lappet faced vulture (torgos tracheliotus) on a rock with wings held partially open, Samburu, Kenya, October, Vulnerable species.

Loic Poidevin / Lappet faced vulture (Torgos tracheliotus) on rock with wings held out, Samburu, Kenya, October, Vulnerable species.

Roland Seitre / Black spider monkey (Ateles paniscus) captive at Singapore Zoo, Singapore. Vulnerable species. Native to eastern South America.

Roland Seitre / Chamek Spider Monkey (Ateles chamek) portrait, captive. Native to Peru, Bolivia and Brazil.

Roland Seitre / Chamek Spider Monkey (Ateles chamek) reaching into river to drink, whilst hanging from branch, captive. Native to Peru, Bolivia and Brazil.

Roland Seitre / Black spider monkey (Ateles paniscus) captive at Singapore Zoo, Singapore. Vulnerable species. Native to eastern South America.

Brent Stephenson / Pied cormorant (Phalacrocorax varius) closeup of head showing the brightly coloured caruncle and eye-ring. Kaikoura, Canterbury, New Zealand, October.

Brent Stephenson / Pied cormorant (Phalacrocorax varius) standing on a rock with wings outspread drying. Christchurch, Canterbury, New Zealand, December.

Denis-Huot / Impala (Aepyceros melampus) male, Masai-Mara game reserve, Kenya, October

Denis-Huot / Impala (Aepyceros melampus) jumping, Masai-Mara game reserve, Kenya, October

Denis-Huot / Lappet-faced vulture (Torgos tracheliotus) in conflict with marabou stork (Leptoptilos crumeniferus) Masai-Mara game reserve, Kenya, August

Hanne & Jens Eriksen / Lappet faced vulture (Torgos tracheliotus) in flight, Oman, February

David Tipling / Black-faced Solitaire (Myadestes melanops) at nest, Savegre, Costa Rica.

David Tipling / Southern Masked Weaver (Ploceus velatus) weaving nest, Namibia.

Lou Coetzer / Two young Impala (Aepyceros melampus) rams play fighting, Chobe River, Botswana, April.

Lou Coetzer / Nile crocodile (Crocodylus niloticus) with mouth clasped round young Impala (Aepyceros melampus) ram for more than 2 hours after taking it, Chobe River, Botswana, May.

Lou Coetzer / Two young Impala (Aepyceros melampus) rams play fighting, Chobe River, Botswana, April.