I'm a zoo person! I love to visit them and watch the animals. One of my favourite zoos is the San Diego Zoo. There the animals are displayed in very natural surroundings and the fact that they are "caged" is rather subtle for the most part.
These gorillas are certainly confined by dry moats and a low fence but no traditional cage for them. They can people watch without the interference of wire.
Not true for this fellow however, for while his habitat is as pleasant as they can make it, he lives his life totally within a large cage. Click to enlarge if you wish.
HAVE A GREAT WEEKEND EVERYONE