We visited the Arizona-Sonora Desert Museum in the Summer of 2014. It is a small zoo and aquarium in terms of numbers of animals and they concentrate on animals found in the Sonora Desert. I rated it is a 3 (out of 10) as a zoo, BUT there is much more to do here than that since it also has a Garden, museum, and Gallery and I think you should spend some time exploring this in depth study of an American Desert.