Whale of a time: pod of 30 orcas bring killer moves to a California bay

Marine biologists were surprised at the display of playful behavior like kids in the park', which lasted more than eight hours

A crowd of 30 killer whales met for a party in California's Monterey Bay on Sunday.

They did belly flops into the water, slapped the waves with their flukes and spewed water from their blowholes, surprising marine biologists who had never seen the animals engage in such playful behavior for so long.