Treating animals so poorly just for the satisfaction of humans is wrong entirely! It is impossible for the animals to be treated properly; the first problem is keeping them in a jail with no freedom.
Some animals in the zoo might be considered an endagered species, so the zoo is trying to `conserve` the said species by keeping them in holding, by taking care of them and breeding them. How can a 10 by 10 cage possibly create a pleasant atmosphere for any species. I think although the zoo is trying to save their species, they are providing a lower quality of life to the animals.
I must admit, I still enjoy going to the zoo, I mean who wouldn`t want to see a lion or a bear! But when it comes to ethics I don`t believe the zoo should play any role in conservation or education, as it is not right.