Martin Nweeia of the Harvard School of Dental Medicine, lead author of the new study published in The Anatomical Record, agrees that the tusk is like the brilliant feathers of a peacock—used to attract females in the mood to mate.
A narwhal's tusk is actually a modified canine tooth that protrudes up to three metres from the left upper jaw and grows in a spiral pattern.
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The narwhal population is currently classified as Near Threatened NT on the IUCN Red List.
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