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For the study, scientists collected brain samples from four sea lions, one fur seal and a tern found dead at the most affected sea lion rookery in Argentina.

In a wildlife camera set up last year near the seal rookery at MacKerricher State Park, ecologist Frankie Gerraty captured a coyote decapitating its prey, confirming many researchers’ hypotheses about the maimed seal carcasses.

The females, they say, may make lots of connections at the rookeries where they congregate to give birth.

Point La Jolla, known as one of California’s prime sea lion rookeries, will no longer be accessible to the public after a unanimous vote by the San Diego City Council.

The declining water level uncovered a land bridge connecting an island rookery to the shore.