Peter Blackwell / Wildebeest migrating across the Mara River, Kenya

TJ Rich / Newborn wildebeest taking first steps beside mother {Connochaetes taurinus} Masai Mara, Kenya, Africa

Richard Du Toit / Impala (Aepyceros melampus) female head profile, Limpopo Province, Pafuri, South Africa

Richard Du Toit / Impala (Aepyceros melampus) two males with antlers locked in sparring dispute, Mpumalanga Province, South Africa

Richard Du Toit / Impala (Aepyceros melampus) male with Red-billed Oxpecker (Buphagus erythrorhynchus) on head and back, Mpumalanga Province, South Africa, June 2012

Richard Du Toit / Impala (Aepyceros melampus) rear view of male with Red-billed Oxpecker (Buphagus erythrorhynchus) on neck and back, Mpumalanga Province, South Africa, June 2012

Roland Seitre / Sheep (Ovis aries) in Ishaqbini Reserve. Kenya, January.

Bryan and Cherry Alexander / Ancient Tireli society sacrificing Goat (Capra hircus)for celebratory feast. Before the sacrifice, they dance around on a roof wielding their wooden staffs (a symbol of their special fraternity). Mali...

Peter Blackwell / Impala males fighting {Aepyceros melampus} Masai Mara GR, Kenya

Peter Blackwell / Female Impala (Aepyceros melampus) with young, Masai Mara GR, Kenya

Richard Du Toit / Female Impala (Aepyceros melampus) drinking at waterhole, Kruger NP, South Africa

Richard Du Toit / Herd of Impalas (Aepyceros melamous) drinking in summer, Kruger NP, South Africa

Peter Blackwell / Male impala (Aepyceros melampus) barking, Masai Mara GR, Kenya

Richard Du Toit / Domestic goats {Capra hircus} overgrazing, near Windhoek, Namibia

Richard Du Toit / Impala tail pattern {Aepyceros melampus} Kruger NP, South Africa

Richard Du Toit / Waterbuck male {Kobus ellipsiprymnus} Khwai river floodplain, Moremi WR, Botswana

Richard Du Toit / Waterbuck females {Kobus ellipsiprymnus} in marshland, Moremi WR, Botswana

Richard Du Toit / Wildebeest {Connochaetes taurinus} male, South Africa

Peter Blackwell / Male Defassa waterbuck grazing {Kobus ellipsiprymnus defassa} Mount Kenya, East Africa

Peter Blackwell / Thomson's gazelle with newborn {Gazella thomsoni} Masai Mara GR, Kenya

Peter Blackwell / Male Thomson's gazelle portrait {Gazella thomsoni} Masai Mara GR, Kenya

Richard Du Toit / Black faced impala (Aepyceros melampus petersi) ewes feeding on soil in dry river bed in the dry season, Etosha NP, Namibia

Richard Du Toit / Wildebeest drinking at waterhole {Connochaetes taurinus} Etosha NP, Namibia

Peter Blackwell / Male Grant's gazelles {Gazella granti} sparring with heads interlocked, Amboseli NP, Kenya, East Africa

Richard Du Toit / Male Black faced impala {Aepyceros melampus petersi} mutual grooming, Etosha NP, Namibia, Southern Africa

Richard Du Toit / Impala (Aepyceros melampus) with Common zebra (Equus quagga). Moremi reserve, Botswana, Southern Africa

Peter Blackwell / Wildebeest crossing river en masse {Connochaetes taurinus} Masai Mara, Kenya, Africa

TJ Rich / Male Impala sparring {Aepyceros melampus} Samburu, Kenya

TJ Rich / Male Impala sparring {Aepyceros melampus} Samburu, Kenya

Peter Blackwell / Wildebeest crossing Mara river on migration, Masai Mara, Kenya

Richard Du Toit / Male Impala (Aepyceros melampus) yearling drinking, Kruger NP, South Africa

Peter Blackwell / Wildebeest with newborn calf, Masai Mara, Kenya

Richard Du Toit / Thomson's gazelle {Gazella thomsoni} Masai Mara, Kenya

Richard Du Toit / Red hartebeest portrait {Alcelaphus caama} Mountain-Zebra NP, South Africa

Richard Du Toit / Mixed herd of Coke's hartebeest {Alcelaphus buselaphus cokii} and Impala {Aepyceros melampus} Masai Mara GR, Kenya

Richard Du Toit / Impala with radio tracking collar and ear tag {Aepyceros melampus} Chobe NP Botswana

Richard Du Toit / Impala female {Aepyceros melampus} feeds on Combretum flowers. Botswana, Savute Chobe

Richard Du Toit / Black faced impala males displaying {Aepyceros melampus petersi} Etosha NP, Namibia

John Cancalosi / Red hartebeest {Alcelaphus caama} South Africa

John Cancalosi / Red hartebeest head portrait {Alcelaphus caama} South Africa

TJ Rich / Newborn wildebeest suckling mother {Connochaetes taurinus} Masai Mara, Kenya, Africa

Angela Scott / Wildebeest about to cross Mara river {Connonchaetes taurinus} Masai Mara NR, Kenya, E Africa. BIG CAT DIARY 1999

Peter Blackwell / Male Grant's gazelles sparring {Gazella granti} Amboseli NP, Kenya, East Africa