On a recent day at the Oakland Zoo's animal hospital, across the bay from San Francisco, an endangered Mexican spider monkey leaps onto tree branches, climbs across platforms and swings on ropes in a ...

Monkeys are not from California. They’re not even visiting snowbirds. But a few have settled nicely into a space customized to their simian preferences.

Institutions that keep captive primates, like zoos or research laboratories, are responsible for the welfare of the animals in their care. This includes providing a stimulating environment, a healthy ...