Species: Hylobates klossii
Common Name: Kloss’s Gibbon, Mentawai Gibbon.
Depending on who you talk to there four genera (Nomascus, Symphalangus, Bunopithecus, and Hylobates) within the family Hylobatidae. There are a number of differences between the genera (anatomical, pelage, and chromosomal). Today’s primate is an interesting member of Hylobates.
Once upon a time, Kloss’s Gibbon was considered to be intermediate between gibbons and siamangs due to the webbing in their toes and their all black coloration. They are native to the Mentawai Islands and parts of Sumatra and Indonesia. Like most gibbons the have long arms and legs but are otherwise shortbodied. They weigh about twelve pounds and are about 25 inches in length with the female being slightly larger than the male. They are monogamous and highly territorial. Like other gibbons they defend their territory, in part, by vocalizations and you can find example here (click on the “Sound Gallery” tab to the left then on Hylobates klossii). The females seem to have longer, more intricate calls than males. Social groups consist of the mated pair plus several offspring. They eat fruit, primarily figs, flowers, small vertebrates, insect, etc. and are diurnal. In turn, they are preyed upon by leopards, large snakes, and large birds of prey.