Some menageries were eventually turned into public zoos. Today most zoos don’t keep animals simply to entertain visitors. Instead zoos have become havens (safe homes) for critically endangered species. Zoos also help to conserve endangered species by studying their habits to understand what threatens them and by breeding the endangered animals and sometimes releasing them into the wild.

There are over 1500 zoos worldwide. No we’re not going to visit all of them but we are going to check out some of the more famous zoos.

San DiegoZoo

The San Diego Zoo has over 4000 animals more than any other zoo in theUnited States. It offers several safaris (parklike zoos in which wild animals are allowed to roam free and are observed by visitors riding through the park in cars or buses). You can travel in a long yellow tram cart or truck to hand-feed rhino and giraffe. Or you can roll through the Asian savanna on a Segway (a type of motorized scooter). If you dare choose a flight safari — you’ll get to view animals while sitting in a harness and whizzing down a three-mile zip-line.