Great Migrations – Episode 1: Born to Move NGC-US: Episiode Code: 3594

Christmas Island: Christmas Island may look like a tiny rock in the Indian Ocean, but it is home to more than 50 million red crabs that complete one of the most harrowing and visually stunning annual migrations. Traveling from deep within the island’s forest to the seashore, these fire engine-red, dinner plate-sized crabs battle against fierce acid-spitting yellow ants as they scuttle to the water and back only once a year to breed.

(Photo Credit: © NGT)