instinct for vengeance. >> if you go back only 35 years, we knew nothing, in fact less than nothing. what the public had was supp superstition and fear. >> these were the vicious killer whales that you know had 48 sharp teeth that would rip you to shreds if they got a chance. what we learned is that they're amazingly friendly. and understanding and intuitive. they want to be your companion. and to this day, there is no record of an orca doing any harm to any human in the wild.