The blue-footed booby -- high-diving seabirds that rarely head out north of Imperial County's Salton Sea -- are being spotted up and down Southern California's coastline, including one in Pacific Palisades.
The birds, which were reported as far north as Marin County, were last seen on Los Angeles County beaches in large numbers in the 1970s, according to the L.A. Times.
The arrival of the birds follows a high mortality event of sea lion pups in Los Angeles County over the summer.
"There's a lot of weird things happening out there," Dan Anderson, a professor of wildlife biology at UC Davis, told the newspaper. "No one is sure of what the cause is."