A narwhal's tusk makes it weird among whales. It's actually a tooth that can reach 10 feet in length, and scientists have numerous theories about its powers and purpose. ➡ Subscribe: http://bit.ly/NatGeoWILDSubscribe ➡ Get More World’s Weirdest: http://bit.ly/WorldsWeirdest About World's Weirdest: A buffalo with three eyes, an exterminator who eats his day’s work, an elephant rampage through a restaurant…all very bizarre, all very real. These shocking and strange animal “viral” m