Wildebeest follow the seasonal rains through Tanzania and Kenya, even through perilous region.
Gnus, or wildebeest, are antelopes. They're linked to oryxes and gazelles.
Wildebeests can reach 2.4 metres (8 feet) and 270 kilos (600 pounds).
The plains of Serengeti in southeastern Africa are often home to wildebeest populations.
Wildebeest graze on Tanzania and Kenya's grassy savannas and open woods for most of their lives.
Each year, more than 1.5 million wildebeest make their way around a massive migration circle.
Many rivers with enormous Nile crocodiles cross its migration route.