Sometimes there are things that are so hard to believe, you just have to see it with your own eyes. According to researchers, they have recently found the longest mammal migration path in the continental United States. Mule deer migrate 150 miles (241 kilometers) in the western portion of Wyoming each year. This migration is no easy task for them as they navigate through many dangerous barriers, such as highways, fences, tough terrain, and bodies of water.

In the video below by Joe Riis, a National Geographic grantee and a regular contributor, watch these mule deer overcome the many obstacles that they encounter on their yearly migratory trek, a trek that has likely been made by them for generations.

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