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GIBBON
, the collective See also:title of the smaller See also:man-like apes of the Indo-See also:Malay countries, all of which may be included in the single genus Hylobates
.
Till recently these apes have been generally included in the same See also:family (Simiidae) with the See also:chimpanzee, See also:gorilla and orang-utan, but they are now regarded by several naturalists as representing a family by themselves—the Hylobatidae
.
One of the distinctive features of this family is the presence of small naked callosities on the buttocks; another being a difference in the number of vertebrae and ribs as compared with those of the Simiidae
.
The extreme length of the limbs and the See also:absence of a tail are other features of these small apes, which are thoroughly arboreal in their habits, and make the See also:woods resound with their unearthly cries at See also:night
.
In agility they are unsurpassed; in fact they are stated to be so See also:swift in their movements as to be able to See also:capture birds on the wing with their paws
..
When they descend to the ground—which they must often do in See also:order to obtain See also:water—they frequently walk in the upright posture, either with the hands crossed behind the See also:neck, or with the knuckles resting on the ground
.
Their usual See also:food consists of leaves and fruits
.
See also:Gibbons may be divided into two See also:groups, the one represented by the siamang, Hylobates (Symphalangus) syndactylus, of See also:Sumatra and the Malay See also:Peninsula, and the other by a number of closely allied See also:species
.
The See also:union of the See also:index and See also:middle fingers by means of a See also:web extending as far as the terminal See also:joints is the distinctive feature of the siamang, which is the largest of the See also:group, and See also:black in See also:colour with a See also: The range of the genus extends from the See also:southern See also:bank of the Bramaputra in Assam to southern See also:China, the Malay Peninsula, See also:Java, Sumatra and See also:Borneo . (R . |
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