Yes. A narwhal’s tusk is an elongated tooth that grows outward through the upper lip. It is not a horn made like the horns of cattle.
An unusual dental arrangement
The familiar spiral tusk usually develops from the left tooth in the upper jaw. It is most often seen in males. Some females have tusks, and rare individuals develop two.
More than a simple spear
Research has demonstrated sensory ability in the tusk. Scientists also investigate how tusks function in social interactions and sexual selection. Finding one function does not establish that it is the tusk’s only purpose.
Why the distinction matters
Calling a narwhal a sea unicorn is memorable, but the nickname hides its anatomy. The structure is a specialized part of a whale’s teeth. Its biology is better understood by studying its tissue, nerves and behavior than by comparing it with a mythical horn.
Keep exploring
Continue with How Do Male Seahorses Give Birth?.
Sources and evidence
- Smithsonian — Narwhal exhibit ↗
Scientific background for the explanation above.
- Smithsonian research — Sensory ability ↗
Scientific background for the explanation above.
- Smithsonian — Two-tusked narwhal ↗
Scientific background for the explanation above.
Sources consulted: 16 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication with institutional sources and a direct answer.