Both the orang and chimpanzee are said[18] to possess this muscle,
but it seems rarely brought into action, at least in a conspicuous manner.
I made my hands into a sort of cage, and placing some tempting fruit within,
allowed both a young orang and chimpanzee to try their utmost to get it out;
but although they grew rather cross, they showed not a trace of a frown.
Nor was there any frown when they were enraged. Twice I took two chimpanzees
from their rather dark room suddenly into bright sunshine, which would
certainly have caused us to frown; they blinked and winked their eyes,
but only once did I see a very slight frown. On another occasion,
I tickled the nose of a chimpanzee with a straw, and as it crumpled
up its face, slight vertical furrows appeared between the eyebrows.
I have never seen a frown on the forehead of the orang.
[18] Prof. Owen on the Orang, Proc. Zool. Soc. 1830, p. 28.
On the Chimpanzee, see Prof. Macalister, in Annals and Mag.
of Nat. Hist. vol. vii. 1871, p. 342, who states that the _corrugator
supercilii_ is inseparable from the _orbicularis palpebrarum_.
The gorilla, when enraged, is described as erecting its crest
of hair, throwing down its under lip, dilating its nostrils,
and uttering terrific yells.
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