Maybe they should evaluate him and figure out why he did what he did so that when he gets released, he's not tempted to do it again.  The story really didn't tell why he did it or if he was mentally challenged or anything, it just says that he injured the bird.  The bird is a sad case of what a zoo is.  Those animals should be in the wild, and not cooped up for people to ooh and aah at them in a park