Nick Garbutt / Herd of White-bearded Wildebeest (Connochaetes taurinus albojubatus) with calves in Long Gully near Ndutu on their annual migration. Ngorongoro Conservation Area, Serengeti Ecosystem, Tanzania. (Digit...

Anup Shah / Aerial view of herd of Eastern White bearded wildebeest (Connochaetes taurinus albojubatus) crossing the Mara River watched by tourist vehicles, Masai Mara National Reserve, Kenya 2008

Nick Garbutt / Massing herds of White bearded wildebeest (Connochaetes taurinus albojubatus) on migration, Serengeti National Park, Tanzania

Denis-Huot / Lion (Panthera leo) male dragging the wildebeest (Connochaetes taurinus albojubatus) prey, Masai-Mara Game Reserve, Kenya

Denis-Huot / Lion (Panthera leo) male dragging wildebeest (Connochaetes taurinus albojubatus) prey, Masai-Mara Game Reserve, Kenya

Nick Garbutt / White-bearded wildebeest (Connochaetes taurinus albojubatus) crossing the shore of Lake Ndutu during migration. Ngorongoro Conservation Area / Serengeti National Park, Tanzania. Digital composite.

Nick Garbutt / Herd of White-bearded wildebeest (Connochaetes taurinus albojubatus) crossing lake shallows on migration, Ngorongoro Conservation Area / Serengeti National Park, Tanzania, East Africa

Christophe Courteau / White-bearded wildebeest / Gnu (Connochaetes taurinus albojubatus) calf with mother grazing, Ngorongoro Crater. Tanzania.

Nick Garbutt / White-bearded Wildebeest (Connochaetes taurinus albojubatus) grazing before Nasera Rocks. Lemuta area, Ngorongoro Conservation Area, Serengeti National Park, Tanzania. (Digitally stitched image.)

Nick Garbutt / Female African Lion (Panthera leo) with young White-bearded Wildebeest (Connochaetes taurinus albojubatus) prey and 4 month cub. Big Marsh, near Ndutu, Nogorongoro Conservation Area, Serengeti Nationa...

Anup Shah / Eastern White bearded wildebeest running (Connochates taurinus albojubatus) Masai Mara National Reserve, Kenya