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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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Orcas in the Gulf of California appear to have gained special skills to hunt and kill the world’s largest fish, according to a new study.. Whale sharks, which grow up to 18m long, are known to ...
Southern resident orcas. In terms of cetaceans, both toothed and baleen whales inhabit the coastal waters of the Salish Sea and the offshore waters of Washington and British Columbia. Of these, the orca is the most famous, with humpback whales and gray whales also well known in the area. Most cetaceans, however, are usually seen in the area ...
As one of the ocean’s apex predators, orcas are known to incorporate their large size and speed into their hunting strategies, said Alisa Schulman-Janiger, a marine biologist and co-founder of ...