I mean, it's possible you hate zoos anyway, but "food" walks past those lions all day long - I highly doubt that the lion knows what a zebra is, unless they took him from Africa as and adult - isn't that illegal? He is still a cat, cats like to play, they tease themselves all day long, it is very unlikely he was starved, etc. I mean, unless I'm right about a basic hatred of zoos, how is this different from when my cat goes crazy like that, trying to get the grass, toy, leaf, his cat friend, etc on the other side of the glass? I've seen him do that very same thing.