One in a Million

A wildebeest is silhouetted against the setting sun on a plain in Kenya's Maasai Mara. More than 1.5 million wildebeests, along with countless zebra, migrate in a huge loop through Kenya and Tanzania each year. They face dangers such as crocodiles, lions and cheetahs, as well as legs broken in the crush of animals trying to hurry across rivers with steep banks.