The _Cebus azarae_,[11] when rejoiced at again seeing a beloved person,
utters a peculiar tittering (_kichernden_) sound. It also expresses
agreeable sensations, by drawing back the corners of its mouth,
without producing any sound. Rengger calls this movement laughter,
but it would be more appropriately called a smile. The form
of the mouth is different when either pain or terror is expressed,
and high shrieks are uttered. Another species of _Cebus_ in the
Zoological Gardens (_C. hypoleucus_) when pleased, makes a reiterated
shrill note, and likewise draws back the corners of its mouth,
apparently through the contraction of the same muscles as with us.
So does the Barbary ape (_Inuus ecaudatus_) to an extraordinary degree;
and I observed in this monkey that the skin of the lower eyelids then
became much wrinkled. At the same time it rapidly moved its lower jaw
or lips in a spasmodic manner, the teeth being exposed; but the noise
produced was hardly more distinct than that which we sometimes call
silent laughter. Two of the keepers affirmed that this slight sound
was the animal's laughter, and when I expressed some doubt on this head
(being at the time quite inexperienced), they made it attack or rather
threaten a hated Entellus monkey, living in the same compartment.
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