Основные цели

Narwhals are perhaps best known for their tusks-they are the only whales that have them. The tusk is an extremely elongated, hollow tooth, which always spirals counter-clockwise from the left side of the skull. It can measure 2.5-2.7 m long (8-9 ft.). Most narwhals have just one tusk, but narwhals with two tusks have been reported. Almost exclusively seen in males, there are only scattered reports of females developing a tusk. Narwhals have no other visible teeth in their jaws. Like the beluga whales, narwhals lack a dorsal fin and instead have a dorsal ridge. Mature narwhals tend to have a black and white spotted coloration the dorsal region of their body, while older narwhals may be almost completely white. Narwhal calves typically are a blotchy gray.

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