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Like the Southern residents, the Northern residents live in groups of matrilines. A typical Northern resident matriline group consists of an elder female, her offspring, and the offspring of her daughters. Both males and female orcas remain within their natal matriline for life. [4] Matrilines have a tendency to split apart over time. [3]
In northern residents, females do most of the herding and hunting of salmon, whereas in southern residents, males do most of the hunting. It has been found that female southern residents do not actively forage when nursing calves, so males must hunt in their place; in northern residents, females continue to hunt even when nursing calves.
A30 Tsitika [6] (1947-2012), born around 1947, Tsitika was one of the oldest killer whales in the northern resident community and one of the few orcas that was already a reproductive mother when first seen in the early 1970s. She was very recognizable due to the distinctive curve of her dorsal fin.
Tracking the Humboldt Current orcas and knowing what the killer whales are hunting and eating will help conservation groups protect the orcas, which are described as “data deficient” by the ...
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A5 Pod is a name given to a group of orcas (Orcinus orca) found off the coast of British Columbia, Canada.It is part of the northern resident population of orcas—a name given to the fish-eating orcas found in coastal waters ranging from mid-Vancouver Island in British Columbia up through Haida Gwaii and into the southeastern portions of Alaska.
Resident orcas stay close to the shore and feed primarily on salmon along the west coast of Canada and into the Pacific Northwest of the U.S., the researchers said.