The greatest threat, due to which this species is in danger of extinction, is deforestation and hunting by man.
The gibbon gets active shortly after dawn, when a male and female form a "duo" to reinforce their bonds as a pair: she emits a series of long and loud screams which increase in volume, while the male responds with simpler and more tremulous ones. They spend the greater part of their day searching for food and eating. They spend 15 minutes a day grooming each other. The Lar Gibbon rarely moves around at night and rests on branches or forks in trees.The method used by the gibbon to move around is hanging and swinging called brachiation and enables it to save energy, as it makes the most of propulsion and uses the body as a pendulum.