It's unclear as to why narwhals have a giant, protruding tooth. Some suggest it's a sensory organ that helps with navigation and hunting. This tusk of the male narwhal can grow as long as 2.6 meters (8.5 feet).
Narwhals Don't Really Have Horns
Key Facts In This Video
Narwhal means "corpse whale." 00:16
The Narwhal's signature "horn" is actually a tooth. 01:31
Climate change is one of the biggest threats to the Narwhal's existence. 02:57
Written by Curiosity Staff October 12, 2014
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