From The Guardian:
Canadian scientists have observed a case of learning and culture in a killer whale. A four-year-old orca in a marine park in Ontario has found a way not just to provide fresh fowl for supper, he has shown other young whales how to do the same thing.
The precocious predator made a practice of regurgitating his fish supper and then lurking just below the water’s surface. The moment a gullible gull touched down for a free meal, the creature lunged.
According to New Scientist today, within a few months the whale’s younger half-brother began trying the same trick. Then a six-month-old calf and an older male at Marineland in Niagara Falls started doing the same thing.