[13] Nat. Hist. of Mammalia, 1841, p. 351.
Mr. Sutton has often observed the face of the _Macacus rhesus_,
when much enraged, growing red. As he was mentioning this to me,
another monkey attacked a _rhesus_, and I saw its face redden as plainly
as that of a man in a violent passion. In the course of a few minutes,
after the battle, the face of this monkey recovered its natural tint.
At the same time that the face reddened, the naked posterior part
of the body, which is always red, seemed to grow still redder;
but I cannot positively assert that this was the case.
When the Mandrill is in any way excited, the brilliantly coloured,
naked parts of the skin are said to become still more vividly coloured.
With several species of baboons the ridge of the forehead projects
much over the eyes, and is studded with a few long hairs,
representing our eyebrows. These animals are always looking
about them, and in order to look upwards they raise their eyebrows.
They have thus, as it would appear, acquired the habit of frequently
moving their eyebrows. However this may be, many kinds of monkeys,
especially the baboons, when angered or in any way excited,
rapidly and incessantly move their eyebrows up and down,
as well as the hairy skin of their foreheads.
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