Instantly the whole expression of the face of the Inuus changed;
the mouth was opened much more widely, the canine teeth were more
fully exposed, and a hoarse barking noise was uttered.
[11] Rengger (`Sagetheire von Paraquay', 1830, s. 46) kept these monkeys
in confinement for seven years in their native country of Paraguay.
The Anubis baboon (_Cynocephalus anubis_) was first insulted
and put into a furious rage, as was easily done, by his keeper,
who then made friends with him and shook hands. As the reconciliation
was effected the baboon rapidly moved up and down his jaws and lips,
and looked pleased. When we laugh heartily, a similar movement,
or quiver, may be observed more or less distinctly in our jaws;
but with man the muscles of the chest are more particularly acted on,
whilst with this baboon, and with some other monkeys, it is the muscles
of the jaws and lips which are spasmodically affected.
I have already had occasion to remark on the curious manner
in which two or three species of Alacacus and the _Cynopithecus
niger_ draw back their ears and utter a slight jabbering noise,
when they are pleased by being caressed.
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