Narwhal

Narwhal facts at a glance

How big is a narwhal?

An adult narwhal measures 5 m long — about 2.9× the height of an average adult person (1.73 m) — and weighs around 1600 kg, about 23× an average adult’s body weight (70 kg).

What is a group of narwhals called?

Explore more animal collective nouns and baby animal names .

The tusk that inspired unicorns

The narwhal's spiraled tusk is its most famous feature — a single tooth that grows straight through the upper lip and can reach 3 m (10 ft) long. Found mainly in males, it is packed with millions of nerve endings, making it a sensitive organ as well as a possible weapon. In medieval Europe, narwhal tusks were sold as unicorn horns for enormous sums.

Life in the Arctic ice

Narwhals are one of the few whales that live in the high Arctic all year, moving with the advancing and retreating sea ice. In winter they dive beneath dense pack ice to depths of more than 1,500 m (4,900 ft) in search of fish, surfacing to breathe through narrow cracks and breathing holes in the ice.

Diet and diving

Narwhals are deep-diving carnivores that feed on Greenland halibut, Arctic cod, squid, and shrimp, often hunting near the seabed in near-total darkness. They make some of the deepest dives of any marine mammal and may use their tusks to stun fish, a behavior that has been filmed in the wild.

Habitat and range

Narwhals live in the Arctic waters of Canada, Greenland, Norway, and Russia, with the largest numbers around Baffin Bay between Canada and Greenland. They travel in groups and migrate seasonally between deep offshore wintering grounds and shallower coastal bays in summer.

Conservation

The narwhal is listed as Least Concern, but it is highly specialized and considered one of the marine mammals most vulnerable to climate change. Shrinking sea ice, increased shipping noise, and changing prey all threaten it, and it is still hunted under managed subsistence quotas by Arctic Indigenous communities.

Did you know? Narwhal facts

• The narwhal's 'tusk' is actually an enormously elongated tooth, usually grown by males.
• The tusk is packed with nerves and may sense the surrounding water.
• Narwhals live year-round in the icy Arctic, among the deepest-diving whales.
• They can dive over 1,500 m to feed beneath the sea ice.
• Narwhals are sometimes called the 'unicorns of the sea'.
• They rely on sea-ice habitat that is changing with the warming Arctic.

Diet & feeding

Narwhals feed mainly on fish such as Greenland halibut and Arctic cod, plus squid, often captured during deep dives beneath the sea ice.

Adaptations

• A spiral tusk rich in nerve endings may detect salinity and other water cues.
• Deep-diving physiology lets narwhals forage far below the surface and ice.
• Thick blubber insulates against the cold of year-round Arctic waters.
• Flexible navigation beneath shifting sea ice allows access to breathing leads.

Behaviour & ecology

• Narwhals form groups and undertake seasonal movements with the sea ice.
• They make deep dives to feed on fish and squid near the seabed.
• Males may cross or rub tusks in social interactions.
• They navigate and overwinter among dense pack ice.

Communication

• Narwhals use clicks, whistles, and pulsed calls for echolocation and contact.
• Vocalisations help coordinate groups beneath the ice.
• The tusk may also play a sensory and social signalling role.

Habitat & range

Narwhals are restricted to the Arctic waters of Canada, Greenland, and Russia, living among pack ice and deep fjords throughout the year.

Ecological role

As specialised Arctic predators, narwhals link deep-water prey to the ice-edge ecosystem and are an indicator species for a rapidly changing Arctic.

Conservation status of the Narwhal

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Narwhal:

• IUCN Red List of Threatened Species

  Conservation status (Least Concern) reflects the IUCN Red List category for Monodon monoceros.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Monodon monoceros. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Monodon monoceros. Explore published occurrence records used in range research.

• Lowry, L. et al. (2017). Monodon monoceros. IUCN Red List of Threatened Species.

  Status (Least Concern) and Arctic dependence.

• Animal Diversity Web — Monodon monoceros. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Nowak, R. M. (1999). Walker's Mammals of the World (6th ed.). Johns Hopkins University Press.

  Tusk and biology.

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.