I share Tom's point of view about zoos, but these are sometimes opportunities for grest images. This one is a good example. Just a nit, the white balance should be adjusted.
Great closeup, Rocky ... makes me wonder what he's thinking about. Im not a great fan of zoos, although I know they're necessary and serve a purpose, but I always feel sorry for the animals caged therein as their world is so limited. In any event, this tiger would be pleased with his portrait ... v