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Orcas or killer whales have a cosmopolitan distribution and several distinct populations or types have been documented or suggested. Three to five types of orcas may be distinct enough to be considered different races , [ 1 ] subspecies , or possibly even species [ 2 ] (see species problem ).
The southern resident orcas, also known as the southern resident killer whales (SRKW), are the smallest of four communities of the exclusively fish-eating ecotype of orca in the northeast Pacific Ocean. The southern resident orcas form a closed society with no emigration or dispersal of individuals, and no gene flow with other orca populations. [1]
Orcas also prey on larger species such as sperm whales, grey whales, humpback whales and minke whales. [ 83 ] [ 39 ] On three separate occasions in 2019 orcas were recorded to have killed blue whales off the south coast of Western Australia, including an estimated 18–22-meter (59–72 ft) individual. [ 88 ]
Northern resident orcas, also known as northern resident killer whales (NRKW), are one of four separate, non-interbreeding communities of the exclusively fish-eating ecotype of orca in the northeast portion of the North Pacific Ocean.
Map Pacific Islands Region Signing of the Pacific Islands Cetaceans MoU by the United States (Shannon Dionne), Bonn, Germany, 27 September 2012 Official signature by the United States. Whales and dolphins migrate over large distances, connecting ocean ecosystems and cultures throughout the Pacific Islands Region. [1]
The duo is well-known among the study’s authors and has been involved in hunting and killing great white sharks for many years. The orcas’ dorsal fins are bent in opposite directions — the ...
The agency has estimated the total number of eastern north Pacific Gray whales to be between 17,400 to 21,300, an increase from an estimated 13,200 to 15,960 whales last year.
The primary diet of transient orcas includes harbor seals, Steller sea lions, harbor porpoises, Dall's porpoises, Pacific white-sided dolphins, and Minke whales. Among these, the harbor seal is the most common prey; one survey estimated that more than half of the diet of transients in the Salish Sea region consists of harbor seals. [ 16 ]