Most of these animals live in trees, but some, including baboons and gorillas, spend much time on the ground. The physical features of primates are basically suited for a tree-dwelling life. For example, the ability to grasp objects helps in climbing and traveling through trees. Most species of primates live in social groups, but some prosimians live alone. The groups vary considerably in size and organization.
Members use signals based on scent, touch, vision, and vocal sounds to communicate with one another.
Primate infants, especially baby human beings and apes, depend heavily on their mother. The young learn much from the mother, including what to eat and what things to avoid. Human beings and the other primates. Many nonhuman primates have great importance to people. For example, scientists use apes and monkeys in research on human diseases.