Lesser apes are small primates belonging to the family Hylobatidae, which includes species like the gibbon and siamang. They are known for their long arms and agile swinging through trees, a behavior called brachiation. Lesser apes are typically found in the tropical forests of Southeast Asia and are characterized by their vocalizations, often producing complex songs. These primates are social animals, living in family groups that help them defend their territory. Lesser apes primarily eat fruits, leaves, and insects, playing a vital role in their ecosystem by aiding in seed dispersal. Their populations are threatened by habitat loss and hunting.