Many people think that animals in the zoo are very happy and lucky, but most of them are sad.Do you know why? Animals like tigers, lions and bears usually live in forests or mountains.They run, jump, play with their children and catch small animals for food.But now they have to stay in cages or small rooms in the zoo.They do not have to find food by themselves.Because the zoo keepers feed them.They do nothing but eat, walk and sleep every day.Their life in the zoo is quite different from that in the forest because they are not free.