videos of killer whales gone wild -- >> pulled under, helpless as the whale drags him below. >> reporter: killer whales, orcas are not whales but dolphins. animal activists claim they're too intelligent, too socially dependent on their fame loilies too big for captivity t the newo scientist claims their aggression on a basic problem they're stir crazy. >> this is not an individual, not a boeing theing that is goi appropriately stimulated by throwing a hoop in the water or doing stupid pet tricks. >> reporter: sea world says it provide killer whales a simulating challenging environment and as for understanding them. sea world says much of what we know today came from studying captive orcas. this man studies bottle the