Southern resident killer whales which are often spotted in the Salish Sea near Vancouver throughout June haven't been seen this season, and scientists believe that could be because of the lack of chinook salmon.

Researchers say their absence is a stark reminder that the orcas are slowly starving to death because there is not enough Chinook salmon to sustain them.

Southern resident orcas are on the brink of extinction, while killer whales to the north are growing in numbers. The contrast exposes what’s killing Puget Sound’s orcas.

Underwater recordings confirm that a new killer whale population is poking its head into British Columbia.