I have had the privilege of photographing wildlife at different game farms and zoos.
Mostly my animals have been photographed in the wild, so I am always a little apprehensive about how a shoot with captive animals will go.
However, almost all published photos of wolves and mountain lions and other shy creatures of the wild have been photographed in places like Animals of Montana.
The result of all this is, that, although you have animals in camera range, it is still up to you to react to animals behaving naturally and to be ready to capture the definitive moments. It is definitely a challenge, but also very rewarding, because many of the photos I got could not be duplicated in the wild even with years of effort.
If you are a professional wildlife photographer, or someone who simply enjoys photographing animals for the sheer wonder of them, I couldn't recommend any place more highly than Animals of Montana. Check out their website when you have time at: http://www.animalsofmontana.com/about_us.html