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9 feet
2
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This is the size that the tooth of the narwhal can reach. Also nicknamed the "unicorn of the seas", the Narwhal is distinguished by this long tooth that arises from its jaw. This tooth is only present in males. They use it as a weapon. It is also an indicator of fertility. A recent study showed that the bigger the tooth, the bigger the testicles. Photo credit: The Explorers
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