It was your usual summer Sunday flea market in Oakland, Calif., until the bat rays decided to show up. Dozens of California bat rays, reports KTVU, swam circles in a briny waterway near the market. "They look like, kind of like rugs," said one young observer.
Bat rays, normally found gliding through the Pacific Ocean's kelp forests and bays, are well-adapted to swimming brackish water. But seeing this many as far inland as Oakland is unusual. It's possible that a lack of freshwater from California's ongoing drought means the waterways are saltier than typical -- more likely to be inhabited by the little saltwater fish and crustaceans that the rays eat.