Some were unable to live life in the wild—they were not able to climb trees, or when they did, they fell off; some did not even move; some were not used to a natural diet. It is a risky business to re-introduce zoo-bred animals to the wild, because if they have lost their instinct for survival and cannot adapt quickly enough, they will die.
In conclusion, it seems that zoos are trying to fulfill their goals to educate and conserve but in the process are harming the animals themselves. What is the solution then? One solution is to protect the natural homes or habitats of animals. Another possibility is to have habitat preserves where wild animals live with the least possible human interference. If the money and expertise that zoos are using today were redirected to habitat preservation and management, we would not have the problems of having to conserve species whose natural homes have disappeared. Nonetheless, there also has to be an international effort to control pollution and the illegal capturing of endangered species.