A year or so ago, I wanted to vomit when I heard of a zoo abroad that killed a perfectly healthy giraffe because it was too inbred and they didn't want him to mate with anyone. Apparently, he was rendered useless because he couldn't be used to procreate. So they chopped him up to bits in front of a crowd and called it research. Oh, and then fed his body to lions. 

More recently, a guy threw himself into a lion's cage as an epic suicide attempt. Rather than letting a man with a suicide note in his back pocket die as he wished, they killed the lions who probably were hoping to still be alive.