A mother zebra and her son's treacherous migration through East Africa and across the Mara River.

Fatal shark attacks in South Africa.

How grassland animals such as the American Bison survive the extreme weather and rugged conditions of the Great Plains.

Frightening stories from fishermen and sailors suggest the mythical creature known as the kraken may be all too real.

Jeremy searches for a modern-day "Jaws" in Florida's Indian River Lagoon and investigates underwater predators in Missouri's Lake of the Ozarks.

Extreme angler Jeremy Wade recalls his encounters with dangerous creatures from the fifth season of "River Monsters."

Chuck and Ernie head to Costa Rica in search of the black-headed bushmaster, a large, venomous pit viper.