The narwhal, a whale with a long, twisted tooth, swims in Arctic waters. Narwhals can grow to be about 16 feet (4.5 m) long (not counting the tooth), and weigh about 1.8 tons. Females are slightly smaller, about 13 feet (4 m) long, weighing 1 ton (0.9 tonnes). At birth, narwhals are about 5 feet (1.5 m) long and 175 pounds (80 kg).

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Narwhal Monodon monoceros Narwhals are one of the most recognizable yet least understood of all whale species. There is debate, for example, on the purpose of the famous narwhal horn, once believed to belong to unicorns. The horn is an extremely elongated, hollow tooth which always spirals counter-clockwise from the left side of the skull. It can measure 2.5 to 2.7 m long (8-9 ft.). There ...