Are Zoos valuable, educational and conservation institutions? Sure, Zoos are interesting but, they are only educational at the sense that they teach disregard for the natures of other living things.
Besides what can you learn about wild animals by viewing them in captivity? Zoos exist because we are intreaged by exotic things. To Zoo goers...zoo animals are just that. Things.
In both cases circuses & zoos...wild & exotic animals are captured, caged, transported & chained to do what humans want them to do...For their entertainment.