| Mountain gorilla populations are extremely tenuous and chimpanzees are hanging by a thread. |
| The gorilla, one of nature's jerry-builders, constructs its sleeping headquarters on a sloping site. |
| The gorilla is famous for knowing sign language, and she was able to sign to her handlers in California that she had a toothache. |
| In fact, Huxley argued, a human differs much less from an ape, such as a chimpanzee or gorilla, than an ape does from a baboon. |
| The pictures show a female gorilla grabbing a branch to gauge the depth of a pool of water before wading across it. |
| Those species were chimpanzee, gorilla, orangutan, gibbon, macaque and owl monkey. |
