neuroscientist says they are one of the few creatures besides us that are self-aware and blames their aggression in activity on a basic problem, they're stir crazy. >> this is not an individual and not a being that is going to be appropriately stimulated by throwing a hoop in the water or doing stupid pet tricks. >> sea world says it continually provides its killer whales a stimulating and challenging environment. and for understanding them, sea world says a bunch of what we know today came from studying captive orcas. he studies bottle nose dolphins. by comparing the health of those in captivity against those in the wild, he says, we can learn of problems in the ocean. >> there are emerging diseases we're seeing. new viruses. we're seeing things like antibiotic resistant bacteria in these dolphins which is a terrific spinoff from pollution from man. >> former trainer says captivity