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.
After breeding, populations in eastern Canada migrate north and reach western Greenland by late spring. Within a few weeks many migrate southward, later joining large molting assemblies east of Greenland in July and August. (Katona et al. 1983).