A small Arctic whale, the male of which has a long forward-pointing spirally twisted tusk developed from one of its teeth.
- Monodon monoceros, family Monodontidae
- Dolphins and porpoises are examples of odontocetes, as are belugas, narwhals, killer whales, sperm whales, and beaked whales.
- Polar bears are seagoing hunters that roam vast areas of the Arctic, pursuing a movable feast of seals, narwhals, beluga whales, and walruses.
- For centuries observers have been fascinated and mystified by the majestic spiral tusk grown by the small Arctic whale known as the narwhal.
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