Many of the natural areas where wild animals live are being destroyed. So zoos in the United States and other countries 31 _ to prevent rare animals from disappearing. The program is called captive breeding. It takes place in zoos which have the best conditions for wild animals to _ 32 _ .The goal of the program is to return _ 33 _ to their homes in the wild.

One animal saved _ 34 _ captive breeding is the golden lion tamarin. This rare monkey’ s only natural home is the forests on the Atlantic Coast of Brazil. In 1970, only two percent of those forests remained. The rest _ 35 _ destroyed to build towns. Only about 100 tamarins live in the Brazilian forest then. No more than 70 tamarins lived in _ 36 _ around the world. _ 37 _ of scientists led by Devra Kleiman of the National Zoo in Washington created a program that increased the reproduction rate of the tamarins.

Now, about 250 tamarins live in a protected forest in Pocodas Antas, Brazil, near Rio de Janeirn; 560 tamarins live in zoos. Eighty live on special farms.

Other zoos also have been successful in _ 38 _ endangered animals reproduce. James Doglan of the San Diego Zoo in California says, that it is difficult _ 39 _ . Animal experts must teach the animals how to find food, how to protect. _ 40 _

_ 41 _ rare animal is called Przewalsk’s Horse. These homes _ 42 _ in Mongolia. They disappeared from the wild in 1968. _ 43 _ , only thirteen of the rare horses lived in zoos.
Today, there are one thousand Przewalski’s Horses in zoos. Oliver Ryder of the zoological society of San Diego says the greatest problem now _ 44 _ a safe place for the homes to live in the wild.
A United States government program permits _ 45 _ citizens to own and protect endangered animals at their homes.