Pileated gibbon (Hylobates pileatus)
Known for their graceful and impressive method of locomotion, and their beautiful and complex duets, gibbons are spectacular to behold in the wild. Male pileated gibbons have short black hair with white hands, feet and brow band, and there is a white circular streak around the crown cap on the sides of the head. Females range in colour from buffy to silvery-grey with a black chest, cheeks and cap and a white brow and facial ring. Infants of both sexes are similar in colour to the adult female, but slightly paler silvery-buff, making the pileated gibbon the only Hylobates species in which males undergo a colour change.
Like other gibbons, the pileated gibbon has a slender body, long forearms and no tail. A throat sac located beneath the chin enhances the spectacular calls which both male and female pileated gibbons make. The male calls with abrupt notes and a trill after the females call. The female call is much louder and distinctive and consists of rich short rising notes lasting around 18 seconds.