[3] Pods consists of related matrilines that tend to travel, forage, socialize, and rest together.
[4] In the summer months the Northern residents can often be observed swimming close to shores of Johnstone Strait and positioning their stomachs to rub themselves on beach pebbles.
More than 90% of the Northern resident population observed in Johnstone Strait visit these rubbing beaches.
[6] The Northern residents have been seen as far south as Grays Harbor, Washington and as far north as Glacier Bay, Alaska.
[9] This is a list of northern resident orca pods that live off the coast of British Columbia, Canada, as of March 2013.