Hylobates moloch (Audebert, 1797), the Javan or silvery gibbon, is a pair-living small ape which is exclusively found in the western and central regions of the Indonesian island of Java. It represents the southernmost occurring species of the genus Hylobates and inhabits the canopy of tropical rainforests. It is foremost characterized by its long silvery-gray fur in combination with a lack of duet songs in mated pairs. Hylobates moloch is threatened by habitat loss as well as the illegal wildlife trade and is listed as “Endangered” (EN) by the IUCN Red List of Threatened Species.