Narwhal (Monodon monoceros)

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MammalArcticToothed Whale

Aerial view of a pod of narwhals (Monodon monoceros) swimming at the surface off Greenland, several showing long tusks. — A pod of narwhals off Greenland; the long tusks of several animals are visible.
Image: Dr. Kristin Laidre, Polar Science Center, UW NOAA/OAR/OER, Public domain, via Wikimedia Commons.

Overview

The narwhal (Monodon monoceros) is a medium-sized toothed whale of Arctic waters, instantly recognisable from the long, straight, spiralled tusk carried by most males. That tusk is not a horn: it is an enormously elongated left canine tooth that grows forward through the upper lip. Narwhals otherwise have essentially no functional teeth.

Narwhals are mottled grey and white, lack a dorsal fin — an advantage for moving under sea ice — and spend their lives in the cold waters of the Atlantic Arctic, particularly around Greenland, Arctic Canada and Svalbard.

Conservation note: narwhals are closely tied to sea ice and to a small number of wintering areas, which makes them sensitive to ice loss, shipping noise and industrial activity. Verify current status with the IUCN Red List and NOAA Fisheries.

Habitat & Range

Narwhals live in the Atlantic sector of the Arctic — the waters around Greenland, the Canadian Arctic Archipelago, Svalbard and the Russian Arctic. They move seasonally between coastal summer areas and deep offshore wintering grounds covered by dense pack ice, where they breathe at cracks and leads in the ice.

Diet

Narwhals feed heavily in winter on Greenland halibut, along with Arctic cod, squid and shrimp. Feeding is concentrated in the cold months, and prey is taken on deep dives; narwhals are among the deepest-diving of all whales, routinely descending far below the surface and staying down for extended periods.

Behavior

Narwhals are social and typically travel in groups, sometimes aggregating into much larger herds during migration. Males often spar with their tusks at the surface, a behaviour called 'tusking'. The tusk is richly innervated and is now understood to have a sensory role as well as a social one; females usually lack a tusk entirely, and a small number of narwhals grow two.

Human Interaction & Conservation

Narwhals have long been hunted by Inuit communities, and subsistence hunting continues under management in Greenland and Canada. The medieval European trade in 'unicorn horn' was in fact narwhal tusk. Today the main pressures are climate-driven sea-ice change, increased shipping and underwater noise in a species that relies on sound. Current status should be checked against the IUCN Red List.

Sourced facts

Each value below is traced to the specific reference that states it. Open a row's evidence to see the source, where to look in it, and how firmly it supports the value. Sources checked 2026-10-09.

Sourced facts about the Narwhal, with the reference supporting each
Fact	What the source states	Evidence
Geographic range	Arctic and Atlantic Oceans, generally between 70° and 80°N; summers in the northern Canadian Arctic near Greenland and migrates in late September to winter in Baffin Bay.ADW adds that narwhals are probably also found elsewhere, because they are seldom seen at the surface.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Geographic Range Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Habitat	Predominantly open, deep Arctic waters; dives reach about 900 m, and both the summer and winter areas contain deep fjords.Dives are deeper and longer while hunting, shallower and more frequent during migration.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Habitat Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Diet	A limited, seasonal diet of fish and squid: Greenland halibut and armhook squid in fall and winter, polar and Arctic cod in spring; apparently no feeding in summer. Crustaceans are minor.Based on stomach contents; no summer stomach contents were found.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Food Habits Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Body size	Adults 4-5 m long; newborns about 1.5 m. The tusk can grow to 3 m.Total body length; ADW does not say whether the adult length includes the tusk, which is mainly a male feature. One adult range is given for both sexes.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Physical Description Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Body mass	Adults 900-1,600 kg; newborns usually around 80 kg.One adult range for both sexes; ADW tags males as larger but gives no sex-specific mass. It adds that 30-35% of a typical narwhal's weight is blubber.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Physical Description Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Lifespan	Wild: about 50 years by one figure, 40.0 years by another; captive narwhals survived only 1 to 4 months.sources disagreeBoth wild figures are averages. ADW says tooth growth-ring ageing has been judged inaccurate, so neither can be confirmed. The captive figure records failed captivity attempts, not a lifespan.	Sources disagree · Animal Diversity Web — how we know What each reading says About 50 years (average, wild) — Animal Diversity Web, ADW prose ('generally accepted', 'cannot be confirmed') and its own data field 40.0 years (average, wild) — Animal Diversity Web, ADW data field credited to the Max Planck Institute for Demographic Research ADW's prose and one data field give an average wild lifespan of about 50 years; a second data field, credited to the Max Planck Institute for Demographic Research, gives 40.0 years. Animal Diversity Web — University of Michigan Museum of Zoology Where Lifespan/Longevity Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Activity pattern	Seasonal: migrates between summer and winter grounds, moving south from late September as the ice changes, and appears not to feed in summer.ADW states no daily (diurnal or nocturnal) activity pattern.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Geographic Range; Food Habits Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Social structure	Highly social: pods of two to twenty-five (average 3.6) that merge into herds of several hundred during migration, then split back into the original pods.ADW says pods follow no pattern of sex, age or relatedness, and that details of narwhal social structure are not known.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Behavior Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Distinguishing traits	Males carry a tusk, a canine tooth erupting through the upper left lip; there is no dorsal fin; adults are dark-mottled above and cream below.Most females have no erupted tusk, though either sex can have one or two; a dorsal ridge replaces the fin; very old males can be mostly white.	Matches source · Animal Diversity Web — how we know Animal Diversity Web — University of Michigan Museum of Zoology Where Physical Description Checked by FaunaHub 2026-10-09 Limits A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
Conservation status	Least Concern (LC), global assessment, 2017	Matches source · IUCN Red List of Threatened Species — how we know IUCN Red List of Threatened Species Checked by FaunaHub 2026-10-09 Limits Read from the Red List export IUCN publishes to GBIF; iucnredlist.org itself does not answer automated reads. Categories are reassessed over time.

References for the facts above

UniversityAnimal Diversity Web — University of Michigan Museum of ZoologySupports: Range, habitat, diet, body size and mass, lifespan, activity and social structure, as the account states them. Retrieved 2026-10-09.Limitations: A peer-edited account written largely by students under faculty review. Figures are compiled from the literature rather than from a single study, and some are regional.
ReferenceIUCN Red List of Threatened SpeciesSupports: The global Red List category and the year of the assessment. Retrieved 2026-10-09.Limitations: Read from the Red List export IUCN publishes to GBIF; iucnredlist.org itself does not answer automated reads. Categories are reassessed over time.

Frequently Asked Questions — Narwhal

Is a narwhal's tusk a horn?

No. It is a tooth — an extremely elongated left canine that grows forward through the upper lip, usually in males. It is spiralled, can reach several metres, and is richly supplied with nerves, which is why it is now thought to have a sensory function alongside its role in male-to-male display and sparring.

Where do narwhals live?

Narwhals are restricted to the Atlantic sector of the Arctic — chiefly the waters around Greenland, the Canadian Arctic Archipelago, Svalbard and the Russian Arctic. They summer in coastal bays and fjords and winter offshore under dense pack ice, breathing at cracks and leads.

What do narwhals eat?

Mainly fish and squid. Greenland halibut is a major winter prey item, along with Arctic cod, squid and shrimp. Narwhals feed on deep dives and take most of their food during the colder months rather than in summer.

Do female narwhals have tusks?

Usually not. The tusk is overwhelmingly a male feature; most females never grow one, though a minority do. A small number of narwhals — again mostly males — grow two tusks.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.

UniversityAnimal Diversity Web — Monodon monoceros (narwhal) — University of Michigan species account
GovernmentNOAA Fisheries — Marine Life — U.S. government science agency for marine species and habitats
Wildlife referenceIUCN Red List of Threatened Species — Authoritative source for current conservation status