Title: Narwhal, facts and photos
Headings: Narwhal
Narwhal
What is the narwhal?
Narwhal tusks
Group travel
These surprising animals have tusks

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What is the narwhal? The narwhal is the unicorn of the sea, a pale-colored porpoise found in Arctic coastal waters and rivers. Narwhal tusks
These legendary animals have two teeth. In males, the more prominent tooth grows into a swordlike, spiral tusk up to 10 feet long. The ivory tusk tooth grows right through the narwhal's upper lip. Scientists are not certain of the tusk's purpose, but some believe it is prominent in mating rituals, perhaps used to impress females or to battle rival suitors. Females sometimes grow a small tusk of their own, but it does not become as prominent as the male's. Group travel
Narwhals are related to bottlenose dolphins, belugas, harbor porpoises, and orcas. Like some other porpoises, they travel in groups and feed on fish, shrimp, squid, and other aquatic fare. They are often sighted swimming in groups of 15 to 20, but gatherings of hundreds—or even several thousands—of narwhals have been reported.