iv. p. 527. {Illust. caption = FIG. 16.--_Cynopithecus niger_,
in a placid condition.
Drawn from life by Mr. Wolf. FIG. 17.--The same, when pleased
by being caressed.}
_Anger_.--This emotion is often exhibited by many kinds of monkeys,
and is expressed, as Mr. Martin remarks,[13] in many different ways.
"Some species, when irritated, pout the lips, gaze with a fixed and
savage glare on their foe, and make repeated short starts as if about
to spring forward, uttering at the same time inward guttural sounds.
Many display their anger by suddenly advancing, making abrupt starts,
at the same time opening the mouth and pursing up the lips,
so as to conceal the teeth, while the eyes are daringly fixed on
the enemy, as if in savage defiance. Some again, and principally
the long-tailed monkeys, or Guenons, display their teeth, and accompany
their malicious grins with a sharp, abrupt, reiterated cry."
Mr. Sutton confirms the statement that some species uncover
their teeth when enraged, whilst others conceal them by the
protrusion of their lips; and some kinds draw back their ears.
The _Cynopithecus niger_, lately referred to, acts in this manner,
at the same time depressing the crest of hair on its forehead,
and showing its teeth; so that the movements of the features from anger
are nearly the same as those from pleasure; and the two expressions
can be distinguished only by those familiar with the animal.
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