The days when people would go to a zoo simply for (0. AMUSE) are long ago. Today, when we place greater (1. IMPORT) on the survival of animals in the wild, zoos have duty to inform the public and improve our (2. KNOW) of the environment and the problems faced (3. WORLD) by large numbers of animals. Today's zoos also play a role in the (4. PROTECT) of threatened species, breeding animals for release in the wild. Many zoos also fund (5. SCIENCE) research into animals and their behavior. The way animals are treated in zoos has changed, too. Many intelligent animals suffer from (6. BORE) in captivity and their keepers now try to improve the (7. PSYCHOLOGY) state of the animals in their care. They do this by, for example, providing the animals with a (8. VARY) of different food or by changing the animals' (9. DAY) routine. Although some critics of zoos remain (10. CONVINCE) , there can be no doubt that animals in zoos today enjoy a more comfortable existence than in the past.