Gary's sentiments are correct as these animals technically are not wild. I have a love/hate relationship with zoos. I hate seeing these animals in such small areas in comparison to the natural habitats. At the same time my son is sooooo interested in animals.
If you have a love hate relationship with zoos I suggest strongly you do a heck of a lot more research and find out who it is that actually is responsible for the vast majority of the promotion/funding/organization of groups that try to preserve animal populations in the wild. You'll find most major conservation efforts are back by a zoo of some sort, if not multiple zoo's. It might also help to do some research and discover that the vast majority of animals that currently live in zoo's were actually born at either that zoo or another zoo and that at the present time they represent the best hope for the survival of many species.
So you can help support your local zoo by purchasing memberships, taking pictures, hopefully helping to encourage people to go to their local zoo and get involved - or you can sit around and nitpick on the internet as to what "category" this picture or that picture belongs in which does no one any good. Personally I'll stick with the former.