Scientists search for clues to the origin of the zebras' urge to migrate.
Scientists search for clues to the origin of the zebras' urge to migrate. With lifespans of just 15 years, signs point to a genetic urge, rather than a taught behavior.
AIR DATE 7/26/17
Traverse the Arctic wilderness and African bush as scientific teams utilize new technology to track caribou, zebras and elephants as they overcome obstacles and face fearless predators on their epic journeys.
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