Often called "the unicorns of the sea," Narwhals are distinguished by a long, spiral tusk protruding from their heads, which is actually an elongated tooth. This remarkable spiralled tooth can grow up to 10 feet long in males, whereas females sometimes have smaller tusks or none at all.

Narwhals feed on fish, squid, and shrimp, including Arctic cod and Greenland halibut. They are social animals, typically found in groups called pods. These pods can range from a few individuals to several dozen. They are known for their seasonal migrations, moving between coastal summer feeding grounds and deeper, offshore wintering grounds.

They are found primarily in the Arctic waters around Greenland and Canada. They undertake long seasonal migrations, travelling from coastal summering grounds to deep offshore wintering areas where they dive under the ice to feed.