Hylobatidae
Primates
Mammalia
210–240 days
1
EEP
It feeds primarily on ripe fruit, especially figs. It supplements its diet with young leaves, flowers, seeds, and, to a lesser extent, insects and other small animals.
Up to 25 years. In captivity: Up to 44 years
The white-handed gibbon (Hylobates lar) is a medium-sized, tailless primate specialized in arboreal life. Its body is agile and light, with very long arms that allow it to move by brachiation between the treetops. It has dense fur that varies from cream to black, but always retains a distinctive characteristic: its hands, feet, and a ring around the face are white, giving rise to its common name. This species shows little sexual dimorphism, although males tend to be slightly more robust. It is predominantly frugivorous, but also feeds on leaves, flowers, and insects, adapting its diet according to the season and availability. Its long canines are present in both sexes, although not associated with aggression, but with feeding. It is a great seed disperser and plays a key ecological role in the tropical forests of Southeast Asia, where it lives at altitudes from sea level to 1.500 meters.
The white-handed gibbon is a strictly diurnal, arboreal primate whose primary mode of locomotion is brachiation: it swings with great agility from branch to branch using its long arms. It lives in stable, monogamous family groups, composed of a reproductive pair and their young. This social system is reinforced by strong bonds and intense cooperation in parenting. They are highly territorial and defend their space through complex, very loud vocalizations, which they emit in duets, especially at dawn. These calls not only serve to mark territory but also to strengthen the bond between the pair. Although they spend most of their time in trees, they frequently rest in high areas of the canopy. They employ grooming rituals and physical contact to maintain social cohesion. Their activity is organized around routines of feeding, moving, and resting, and they are very sensitive to habitat disturbances and forest fragmentation.
The white-handed gibbon (Hylobates lar) is classified as Endangered (EN) by the IUCN Red List due to a significant population decline over the past few decades. This decline is closely linked to intensive deforestation in Southeast Asia, driven primarily by extensive agriculture (including oil palm), commercial logging, and urban development. Its habitat has become highly fragmented, limiting population movement and reproduction. It also faces threats such as poaching for the illegal pet trade and capture as exhibition animals. It is listed on CITES Appendix I, which prohibits international trade. Although some populations survive in protected areas, many lack effective monitoring. ADW also highlights its vulnerability to canopy fragmentation, which is essential for its movement. Programs such as the EEP promote its captive breeding, but in situ conservation is a priority to ensure its survival.
The white-handed gibbon is one of the few primates that moves by brachiation, using its long arms to hang and swing between trees with great agility.
It can travel up to 15 meters in a single leap and reach speeds of over 50 km/h between branches.
Despite not having a tail—like all apes—it maintains perfect balance during its aerial movements.
They are known for their complex and melodious vocalizations, especially the "duets" that pairs perform to mark territory and strengthen bonds.
These songs can be heard several miles away and vary between individuals, suggesting some degree of vocal culture.
They present chromatic dimorphism: there are completely black or cream-colored individuals, without this indicating sex differences.
The long fingers and white hands contrast with the rest of the body, a distinctive feature of this species.
They are strictly arboreal; they rarely descend to the ground, making them vulnerable to habitat loss.
It is considered one of the few primates with stable monogamous relationships, although recent studies have revealed some social flexibility.
They exhibit territorial behavior: pairs vigorously defend their areas through vocal calls and visual displays.
They communicate not only through sounds, but also through gestures, looks, and body postures.
Their vocal system includes a specialized organ called the throat sac, which amplifies sounds during singing.
They can live up to 40 years in captivity, although their life expectancy in the wild is around 25–30 years.
They are considered key species for tropical rainforest ecosystems, as they disperse seeds of fruit trees.
The white-handed gibbon is a culturally significant species in regions of Southeast Asia, appearing in local legends.
They are protected by CITES (Appendix I), and their trade is strictly prohibited.
Their hairless faces and expressive eyes give them a very human-like appearance, making them symbols of lesser ape conservation.
Their social and vocal behavior has been the subject of numerous studies on the origin of language in primates.
They are one of the few primates that can stand upright while walking on thick branches, with their arms outstretched for balance.
Their specialized lifestyle has made it difficult for them to adapt to fragmented areas, which increases their vulnerability to deforestation.
