Assertion: narwhal | /r/CapableOf | grow to as long as 18 feet
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text: Lurking in the frigid Arctic waters around Russia, Canada and Greenland, and capable of diving to nearly 5,000 feet below sea level, the narwhal can grow to as long as 18 feet, and is most famous for having a canine tooth that (primarily in males) bursts through the upper lip and grows into a 5- to 10-foot-long tusk.