Lesser apes are a group of primates that include gibbons and siamangs. They are smaller than great apes, such as chimpanzees and gorillas, and are known for their long arms and agile movements. Lesser apes primarily inhabit the forests of Southeast Asia and are often found swinging through the trees. These animals are social and live in family groups, often consisting of a mated pair and their offspring. Lesser apes are also known for their vocalizations, which can include complex songs used for communication. Their diet mainly consists of fruits, leaves, and insects, making them important for forest ecosystems.