Richard Du Toit / Black Wildebeest (Connochaetes gnou), Rietvlei Nature Reserve, South Africa

Richard Du Toit / Black wildebeest (Connochaetus gnou) bull silhouetted at dawn, Rietvlei Nature Reserve, Gauteng Province, South Africa.

Ammonite / Large group of Black wildebeest (Connochaetes gnou) migrating across savanna in a line, footage taken at night using thermal camera technology, Masai Mara, Kenya.

Anup Shah / Black-backed jackals (Canis mesomelas) feeding on a wildebeest carcass. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Black-backed jackal (Canis mesomelas) standing next to a wildebeest carcass. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Andy Rouse / Common wildebeest (Connochaetes taurinus) gathering to cross river on migration, Masai Mara, Kenya

Andy Rouse / Nile crocodile (Crocodylus niloticus) chasing Wildebeest (Connochaetes taurinus) during migration crossing, Masai Mara, Kenya, Africa

Martin Dohrn / Stampeding Wildebeest {Connochaetes taurinus}. Heads held low to see ground in pitch black night. Serengeti, Tanzania, East Africa. Infra red image from 'Starlight' camera, from film.

Richard Du Toit / Black Wildebeest (Connochaetus gnou) Rietvlei Nature Reserve, South Africa

Richard Du Toit / Black wildebeest (Connochaetus gnou) adult with young, Rietvlei Nature Reserve, Gauteng Province, South Africa.

Richard Du Toit / Black wildebeest (Connochaetus gnou) head profile portrait, Rietvlei Nature Reserve, South Africa

Richard Du Toit / Black wildebeest (Connochaetus gnou) portrait, Rietvlei Nature Reserve, Gauteng Province, South Africa.