Traditionally this taxon has been restricted to modern humans and their non-ape fossil ancestors, with the apes belonging to sister taxa, the Hylobatidae (gibbons and siamangs) and the Pongidae (great apes).    From Wordnik.com.  [Meet Selam - The Panda's Thumb] Reference

Primates, like orang utans, owa (a gibbon from the Hylobatidae), siamang and mammals such as bears, white tigers, Sumatran tigers and Sumatran elephants are just a few of them.    From Wordnik.com.  [The Jakarta Post Breaking News] Reference

The family Hylobatidae consists of 4 genera and 14 species of gibbon, including the Lar Gibbon and the Siamang, collectively known as the lesser apes.    From Wordnik.com.  [Ardi is a million years older than Lucy - The Panda's Thumb] Reference

Hylobatidae.    From Wordnik.com.  [Western Java rain forests] Reference