Quick answer
Narwhals typically weigh around 800–1,600 kg (1,800–3,500 lb), with length and height varying by sex and population. Size influences diet (Carnivore (fish, squid, shrimp)), home range, and predator risk.
Key takeaway
Narwhals typically weigh around 800–1,600 kg (1,800–3,500 lb), with length and height varying by sex and population. Size influences diet (Carnivore (fish, squid, shrimp)), home range, and predator risk.
Typical Narwhal size
Adults are often described at 800–1,600 kg (1,800–3,500 lb). Guides may list head-body length separately from tail; museum skins and live weights do not always match.
Males, females, and growth
Many species show sexual dimorphism. Juveniles reach adult mass over months to years; nutrition in Arctic oceans and ice-edge waters affects final size within genetic limits.
Why narwhal size matters
Body size shapes diet (Carnivore (fish, squid, shrimp)), territory size, predator risk, and rough longevity patterns around 50+ years.
Measuring narwhals
Live weights are hard to take; researchers use morphometrics, cameras, or carcass data. Treat tourist guesses cautiously.
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.
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.
Sources
Narwhal FAQs
How big is a narwhal?
Narwhals typically weigh around 800–1,600 kg (1,800–3,500 lb), with length and height varying by sex and population. Size influences diet (Carnivore (fish, squid, shrimp)), home range, and predator risk.
What is the scientific name of the narwhal?
Monodon monoceros — used in research and conservation listings for narwhals.
What do narwhals eat?
Narwhals eat fish, squid and shrimp, with seasonal and regional variation in Arctic oceans and ice-edge waters.
Where do narwhals live?
They are associated with Arctic oceans and ice-edge waters. Local presence depends on food, cover, and human land use.
What is the conservation status of narwhals?
Listed in our guides as Least Concern. Check the IUCN Red List and national assessments for the latest formal category.