The wildebeest migration is one of the best known wild events, yet wildebeests are not the only animals to travel vast distances en mass to ensure the survival of their species. Meet some wild marathoners who take epic journeys, including the flying critters from the worlds largest bat colony and the truly breathtaking Christmas Island crabs.
Restless Planet: Epic Journeys premieres Wednesday December 1 at 9P et/pt
Video Preview: The giraffe and the ostrich are constantly on the move. No need to follow the rains, they can go days without drinking.