Orangutans are threatened with exticntion for many reasons. There only hunter is man. Humans kill them for their furs. The babies are sold to people as bets and when older are held in captivity. In captivity, they are kept from the wild and can't repopulate the species.
Galdikas acts as advocate and provides medical care. She teaches them how to survive in the wild. Orangutans need this care to keep healthy and eventullay survive in the wild.