Frugivores and, to a lesser extent, folivores. There is little evidence for birth seasonality. Gibbons are sexually mature at about 8-10 years of age. Mating is very infrequent. Little estrus swelling.
Gibbons are monogamous and territorial.
Territories are maintained by loud vocalized singing. Mated pairs produce an average of 5-6 offspring during their reproductive lifespan. There is little or no sexual dimorphism in canine size or body wt. There is little or no sexual dominance. Males are active fathers, frequently grooming and handling infants.