Wildebeest struggling up a muddy slope out of the Mara river.

Aerial view of the blue wildebeest migration

Aerial view of the blue wildebeest migration

Aerial view of the blue wildebeest migration

Herd of wildebeest on their annual migration.

Aerial view of the blue wildebeest migration

Aerial view of the blue wildebeest migration

Wildebeest and zebra crossing the Mara river on their annual migration.

Wildebeest charging through the Mara river, as part of the annual migration.

Nile crocodile catching blue wildebeest in the Mara river

Nile crocodile catching blue wildebeest in the Mara river

Wildebeest leaping in to water to cross the Mara river, this is part of the annual migration.