its horrible what happened, some ppl may get offended about what im about to say next, but its my own opinion: i dont think its right for zoos to keep animals in captivity like that and most of all to "trim" the rays just too keep ppl from getting hurt. if those rays had been in the wild, then nothing like this would have happened. maybe that hippo died as well from stress or something, but animals are not meant to be in captivity. if they are tank bred...thats another question. but if they are taken from the wild and imprisoned for our own enjoyment then thats not good. like this article i read about a massive ray that was captured, she soon gave birth to a pup after - probably because of stress, but now that pup is open to public attention, why cant they just leave her and her pup alone? this stuff isn't good.