Al Jazeera America: Revealed: Biologists discover longest mammal migration in Lower 48

Al Jazeera America: Revealed: Biologists discover longest mammal migration in Lower 48

Al Jazeera America's Nate Schweber recently reported on the Red Desert to Hoback mule deer migration.

When wildlife biologist Hall Sawyer strapped radio collars to dozens of mule deer wandering southwestern Wyoming’s Red Desert in January 2011, he thought the humble animals were as rooted as the landscape’s windblown sage, low hills and staked fence posts.

Then the deer vanished out of radio range.