The adult male
Southern White-cheeked Gibbon
is overall black with a prominent tuft and distinct white patches on the
lower cheeks, and which reach only half way to the ears and to the edges of
This is different from the
Northern White-cheeked Gibbon (fig.),
in which the white cheek-patches reach to the
upper borders of the ears and do not touch the corners of the mouth.
Thai Animal Names.