whale-on-whale aggression was just part of your -- you know, the daily existence. >> we ask that you use the stairs and aisle ways as you exit. please do not step on the seats. these areas may become wet, and therefore slippery to some footwear. thank you. ♪ >> in the wild when there's tension they have thousands of square miles to exit the scene and they can get away. you don't have that in captivity. could you imagine being in a small concrete enclosure for your life when you're used to swimming 100 miles a day? >> sometimes this aggression became very severe, and in fact whales have died in captivity because of this aggression. >> i think it was 1988 kandu tried to assert her dominance over corky. rammed corky. it fractured her jaw, which cut an artery in her head, and then she bled out.