Poor Prisoners

One day, I have been to Zoo recently. Lot more time I saw animals jailed in there before. But recently when I went there I realized that the animals and birds of rare are kept behind the bars. Think here. What the wrong they did to keep that in the prison only for the reason of people entertainment. Crows are flying freely outside, but the five colored parrots and white turks are kept in a small cage with little food.The water inside every animals' habitat is a rain water with full of animal shit, inadequate and liable to cause sickness. Human being, when did some anti-social thing, he is punished and called prisoners. Why these poor animals and birds are given lifetime rigorous imprisonment. It must be planned in such-a-way that everything will be left freely like Vedandhangal bird sanctuary, and animals are kept in a vast area with a perfect pathway kept where people can watch.Shouldn't it be given freedom? There is a difference between a wild tiger and a zoo tiger.....