Behind the scenes at the zoo

"Most animals in zoos are born in other zoos," says Tucker. "It's extremely rare to pull animals from the wild now. There's more focus toward conservation."

The Stone Zoo has eight new Mexican gray wolf pups that are part of a special reintroduction project. The wolves are essentially extinct in the wild, and the US Fish and Wildlife Service has reintroduced experimental wolf populations into New Mexico and Arizona. Someday, the zoo's pups may run free there.

During the day, zookeepers observe the animals and take careful notes. They clean night dens and stalls and may redo an exhibit's "furniture." (Furniture, at the zoo, is anything in the exhibit, such as perches.)

Come closing time, the keepers must secure all animals for the night. To lure an animal back into its den, keepers put down food, open the door, and lock it after the animal goes in to eat.

The spider monkeys especially like to try to outsmart the keepers at closing time, says Sandy Elliott, Stone Zoo's lead zookeeper. "With two spider monkeys, one will run in and bring food to the other. So we started putting TV (they like cartoons) or wind chimes [in the den], anything that would be new and interesting. The male is territorial, and the female is curious, so they'll seek out something new."

The key to success with animals is observation, says Ms. Elliott, who has 22 years of zoo experience. "You have to watch them, what they're afraid of, where you have successes and where you don't. You have to stay outside yourself and let them teach you."

We asked Libby Tucker of Zoo New England to recommend good pets.

Cats and dogs?

Absolutely. These are domesticated animals, which means they've been bred as pets for thousands of years and are dependent on humans.

Macaws or other large parrots?

No. In the wild, parrots live in large flocks and form strong bonds with one another. They'll need more time and attention than you can probably give them. When they don't get it, they may scream or become destructive or aggressive. Smaller birds, such as parakeets, are fine if you're willing to put in the time caring for them.

Ferrets?

No. Although ferrets are technically domesticated animals (they were used 2,500 years ago in Europe), animal shelters are full of abandoned ferrets. Ferrets need as much attention as dogs do, but people seem to lose their interest in them quickly. Even though their scent glands are removed before they're sold as pets, ferrets are related to skunks and are still very smelly. And they do bite.

Iguanas?

No. It's not true that iguanas grow only to the size of their tank. They grow very large - up to six feet.

Rats?

Sure. You can get domestic rats. They're smart, and they acknowledge you much more than many exotic pets.

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