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SEATTLE — Two more Salish Sea orcas are ailing and probably will be dead by summer, according an expert on the critically endangered population of killer whales that live in the waters of the Pacific Northwest.

Drone photography taken this past September showed the ailing population of orcas known as the southern residents went into the winter thinner than they were when the whales arrived in the San Juan Islands last summer.

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They also are thinner than the so-called northern resident population of killer whales, which have been steadily growing in population for the past 40 years in their home waters primarily in northern B.C. and southeast Alaska, where they have access to more fish and cleaner and quieter water. The northern residents gave birth to 10 new calves last year.

The Seattle Times reports Center for Whale Research founding director Ken Balcomb said photos taken of a southern resident orca known as J17 on New Year’s Eve showed the 42-year-old female has so-called peanut head — a misshapen head and neck caused by starvation. In addition, a 27-year-old male known as K25 is failing, also from lack of sufficient food. He lost his mother, K13, in 2017 and isn’t successfully foraging on his own.