The “Fanged Deer” Reappears in Afghanistan

How do we know if animals are really extinct?

Researchers report that the Kashmir musk deer, known for its tusks, has been spotted in northeast Afghanistan for the first time in more than 60 years. The video above examines the species and explains why wildlife authorities never declared the deer extinct, even though it hadn’t been spotted since 1948.

Update, Nov. 28, 2016: This video has been removed pending the resolution of a licensing claim.