- A yawning gorilla may have more in mind than a quick snooze. If it feels threatened or nervous, a gorilla will give a gaping yawn which shows off its sharp teeth.
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- Gorilla, mammal, largest, and most powerful anthropoid ape.
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- Gorillas inhabit the forests of equatorial Africa from the western lowlands near the Cameroon coast to an altitude of about 3,000 m (10,000 ft) in the central highlands of Zaïre and Uganda.
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- Three geographically distinct types are recognized: the western lowland gorilla, the eastern lowland gorilla, and the more densely coated mountain gorilla.
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- The mental capacity of the gorilla is still being explored. Not as curious or excitable as its nearest relative, the chimpanzee, the gorilla shows more persistence and memory retention in solving a problem, and is more likely to perform a task out of interest than to earn a reward.
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- After some success with chimpanzees, researchers in the mid-1970s turned their attention to communicating with gorillas by means of the American sign language, and one gorilla mastered more than 100 words.
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