The Gibbon:
Hylobates, commonly known as the gibbon, is the smallest, most successful, and the most specialized of the living apes. There are many distinct gibbon species and subspecies that range in size of 4-11 kg and display no sexual dimorphism. These primates are found in Southeast Asia, from Southern China to Eastern India, and inhabit the evergreen forests in these regions. Gibbons are primarily arboreal, almost never going to the ground, and move through the forests by brachiating from tree to tree. Their diet consists of fruit, leaves and insects. Most gibbons live in small monogamous families with the immature offspring and are very territorial with neighboring families. These small apes have simple molars, short but broad incisors, sharp canines and premolars, short snouts, large orbits, and shallow faces. They rarely develop a sagittal crest on their rounded braincase, and their mandibular ascending ramus is broad.