Uce, the baby orangutan first rescued by Smits, was the first orangutan to graduate from the reintroduction program and give birth in the wild. Contact the news desk . More Information Orangutans are one of the four great ape species that include gorillas, chimpanzees, and bonobos. There are many strains of the HIV virus. The orangutan is the only strictly arboreal ape and the largest tree living mammal in the world.
Humans are the orangutan's greatest enemy.