If they are endangered, yes.

No, animals wanto to be free in nature. 

I don't think so.

The environment has change, the animals may hardly to adapt the new environment.

  I cannot   determine if it is right,  but I certainly think it is  a very expensive and costly enterprise,

highly impractical, and I do not know if there are benefits which are worth the cost of maintaining

the facility.  In short, it is a massive waste of money, and usually it is at the taxpayer expense.

No one ever ask any animal in zoo whether they want to be kept in cage or not, so I guess they have no choise. It`s not right nor is it wrong, it just a life.