She screamed loudly with widely-open mouth, the lips being retracted so that the teeth were fully exposed. She threw her arms wildly about, sometimes clasping them over her head. She rolled on the ground, sometimes on her back, sometimes on her belly, and bit every thing within reach. A young gibbon (Hylobates syndactylus) in a passion has been described[1] as behaving in almost exactly the same manner.
"The lips of young orangs and chimpanzees are protruded, some-times to a wonderful degree, under various circumstances. They act thus, not only when slightly angered, sulky, or disappointed, but when alarmed at any thing—in one instance, at the sight of a turtle[2] and
Fig. 11.
Chimpanzee disappointed and sulky.—(Drawn from Life by Mr. Wood.)
likewise when pleased. But neither the degree of protrusion nor the shape of the mouth is exactly the same, as I believe, in all cases; and the sounds which are then uttered are different. The accompanying drawing represents a chimpanzee made sulky by an orange having been offered him, and then taken away. A similar protrusion or pouting of the lips, though to a much slighter degree, may be seen in sulky children."
