Scientific name : Symphalangus syndactylus

It can be found both in the plains and in mountains of up to 3 800 meters.
The siamang is the biggest of all gibbons species. It is characterised by the second and third finger which are connected by a membrane. Their feet have five toes. Siamangs can pick up and carry things with either their arms or their legs, with an equal amount of ease.

Did you know?

A voice that goes beyond the mountains

Check out those decibels! Their cry can be heard more than five kilometres away! They have quite a big laryngeal bag, like a resonance chamber, at neck level that enables them to make loud sounds. The chamber is not covered with fur and rises up when the siamang makes noise.

Key figures

  • Weight: 8 to 13 kg
  • Height: 75 to 90 cm
  • Arm length: 1.50 m to 1.80 m!
  • Gestation period: 190 to 240 days with a birth weight of 400 to 600 g
  • Life expectancy: 35 years

Linking humans and animals

The Gibbon father dotes on young

The siamang is monogamous; the female is dominant. This species has family ties that are even closer than other gibbons. The male, the female and the offspring stay at a distance of less than 10 metres from one another. The young animal doesn't leave its mother until the age of 8 months. At that point, it begins to be carried by its father, who brings it back to the mother for nursing and sleeping.