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Does the narwhal's famous tusk help it catch fish?

Narwhal whales live in social groups called pods and live in the Arctic ocean. Experts disagree on the purpose of males' tusks. (Getty Images/iStockphoto)
Narwhal whales live in social groups called pods and live in the Arctic ocean. Experts disagree on the purpose of males' tusks. (Getty Images/iStockphoto)

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