Traverse three highways, multiple water crossings, sand dunes, and over 100 fences in A Deer Migration You Have to See to Believe. This National Geographic video by Joe Riis shares the incredible yearly journey of mule deer herds – nearly 5000 animals  on the longest large mammal migration in the continental United States: 150 miles (241 kilometers) through western Wyoming.

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In the archives: more excellent migration videos, including TED Ed’s Bird migration, a perilous journey and behind the scenes of the red crab migration.

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