| Other endangered primates now include lemurs in Madagascar, tamarins in Brazil, langurs in Vietnam, orang-utans in Sumatra, and gorillas and a variety of monkeys in Africa. |
| The argument is at its most powerful when it comes to the great apes chimpanzees, gorillas and orang-utans. |
| The illegal logging destroys the habitat of rare species such as orang-utans, Sumatran rhinos, and sun bears. |
| The endangered orang-utans live wild only on the islands of Sumatra and Borneo, and are the largest arboreal mammals on earth. |
| The four orang-utans and two gibbons were returned to Indonesia after being illegally poached and smuggled to Japan eight months ago. |
| It turns out you don't know them at all because orang-utans show incredible invariability across their range. |
