Narwhal calves

Filed under Narwhal · Narwhal Whales editorial team

See all narwhal pictures & images →

The narwhal whale is able to produce a calf once every 3 years with a 15-month gestation period. Newborn calves are dark blue-gray, but as they mature the back transforms to an olive brown and begin to develop the spotting which is most often seen in adults narwhals.

Narwhals calves are usually born in July and are rarely born outside deep bays and inlets and remain with the female narwhal for up to twenty months after they are born.

As adults the calves can grow to become 4.6 meters and weigh up to 1600 kilograms, if male. The female of the species can grow up to 4 meters and weigh up to 1000 kilograms.

Updated & expanded — current sourced facts

The reference notes below were added by the Narwhal Whales editorial team to bring the original article up to date with current, sourced facts (IUCN Red List, NOAA Fisheries, NAMMCO). They supplement — and do not replace — the original article above.

Narwhal calves are born relatively infrequently within the Arctic population. Female narwhals typically give birth to a single calf once every three years, following a gestation period of approximately 14 to 16 months. Most births occur during spring and summer months, with peak calving around June through August. Newborn calves measure roughly 1.5 to 1.6 meters in length and display a dark blue-grey coloration that differs markedly from their parents' appearance.

The distinctive mottled black-and-white pattern characteristic of adult narwhals develops gradually over time as calves mature. During their early months, newborns remain in close proximity to their mothers, nursing on nutrient-rich, fatty milk essential for rapid growth. This maternal dependency extends well beyond infancy, typically lasting approximately 20 months or longer. Throughout this extended nursing period, calves learn critical survival skills from their mothers, including diving techniques and feeding strategies necessary for life in Arctic waters.

As calves progress toward independence, they gradually acquire the behavioral and physiological adaptations that define the species. Adult males eventually reach approximately 4.5 meters in length and weigh up to about 1,600 kilograms, while females remain notably smaller. The slow reproductive rate and extended maternal care period reflect the narwhal's adaptation to the challenging Arctic marine environment, where prolonged parental investment supports offspring development in waters that demand specialized hunting and diving capabilities.

This page updates and corrects an original narwhalwhales.com article with current, sourced facts.

Sources: NOAA Fisheries — Narwhal; IUCN Red List — Narwhal (Monodon monoceros). Educational information only. See our sources & fact-check policy.

More in Narwhal

All narwhal →