The population in this area consists of 2 communities. There is a clear lack of dispersal, which is rather unusual for mammals. This lack of dispersal may give rise to a wide range of local races. Apart from the resident population, there is also a transient population in the BC area. Pods along the Norwegian coast consist of 7-15 animals.
Some animals travel quite a distance.
So far there is no evidence for mixing of the Icelandic and Norwegian populations. Also the analysis of vocalizations showed little evidence for mixing of the groups. Physical maturity is attained at 20-25 years. Their first viable calf is born at an age of 14.9 years. The maximum longevity is 80-90 years.