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Narwhal tusks
The narwhal (Monodon monoceros) is one of the least studied animals because of the difficulty of access to the arctic zones where it lives. Its twisted tusk, which is not really a horn but a relatively flexible outgrowth of its left canine, is an ultra-sensitive and multifunctional appendix. It is used in particular for its echolocation but also to hunt big fish, like the polar cods, by striking and stunning them to capture them more easily.
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