Adoptive mother Mandara, a lowland gorilla, cares for her own offspring, Kejana, and another toung gorilla, Baraka, in 1992. Strangely, Mandara traded babies with Baraka's mother, Haloko. Careful study of gorilla social structure in the wild, as well as the exchange of gorillas with other zoos, has led to a healthy, growing captive population of these endangered animals.