The narwhal is a type of marine mammal belonging to the Monodontidae family, which also includes belugas. Narwhals are notable for their long, spiral tusk, which is actually an elongated tooth found in males and some females. This tusk can reach lengths of up to 10 feet and is thought to play a role in social interactions and mating displays. Narwhals primarily inhabit Arctic waters and are often found in deep, ice-covered regions. They feed on fish, squid, and other marine organisms. Their unique appearance and adaptations to cold-water environments have made them both a subject of fascination and conservation concern.