‘We're really worried’: 4 grey whales found dead off B.C. coast in 10 days

https://i.cbc.ca/ais/d0908b49-0876-4dbc-8af4-dd97c95abee7,1776818454438/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C0%2C1920%2C1080%29%3BResize%3D%28620%29" title="The Department of Fisheries and Oceans conducted three necropsies on dead grey whales found off Vancouver Island." width="620" />

In April, four grey whales were found dead off Vancouver Island, adding to a long list of recent deaths off the coast of Washington state and San Francisco.

Researchers believe a dramatic decline in available prey may be to blame.