Weird story from Wired.
The sea lions’ disappearance is as strange as their initial colonization of the pier about 20 years ago, in late 1989. They just started showing up one day and as their numbers increased, their traditional hang out, Seal Rocks, became less populated. There are all sorts of theories about why the pier became a favorite haul-out spot for the sea lions, but no one knows for sure why the animals’ behavior changed.
Stoudt averred that the officials at the Marine Mammal Center weren’t worried about the animals’ disappearance from their standard location. The sea lions are migratory animals, after all, and it’s natural for them to move around.