Non-Migrant: No. All populations of this species make significant seasonal migrations.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: Yes. At least some populations of this species make annual migrations of over 200 km.
Moves northward to edge of pack ice in Davis Straight in spring and summer (Leatherwood and Reeves 1983). In the eastern Atlantic, moves northward April-July, southward July-September (see IUCN 1991). In general, migratory movements are poorly documented (Reeves and Mitchell 1993, Reeves et al. 1993).