Gibbons are monogamous and they live in family groups with an adult pair and their young offspring. The family stakes out a territory and defends it using loud, haunting calls that can echo for miles throughout the forest.
Gibbons are among the fastest of all primates; they can run up to 34 miles per hour (almost 55 km per hour), which is around the same speed as a galloping racehorse.
Although gibbons live in family groups, each member, except for females with their babies, of picks their own sleeping tree. They sleep sitting up in trees with bent knees and faces buried between the knees and chest. Gibbons sleep for about 14-17 hours.