Seasonal breeding of the narwhal (Monodon monoceros L.)

The narwhal (Monodon monoceros) has been shown to be a seasonal breeder, like the closely related beluga (Delphinapterus leucas). The gestation period is estimated to be about 14 months, while the reproductive cycle is 2 or 3 years. Narwhals appear similar to other odontocetes in those reproductive aspects for which there is information.