As its name suggests, this macaque is characterised by its short, 'pig-like' tail, which it normally carries in an erect backward arch over the back, with the tip partially resting on the rump. This species resembles the Sunda pig-tailed macaque (Macaca nemestrina), but is smaller in size and has comparatively short limbs and face. The macaque possesses a relatively long, uniformly agouti golden-brown coat, with markings confined only to the brown crown, buff-coloured cheek whiskers and the red streak extending from the outer corner of each eye. A distinct tuft of hair also exists at the end of the tail. Young are a blackish colour when born, but juveniles are rather more brightly coloured than adults (2).