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. They also study the behavior of nonhuman primates to learn more about human behavior. Some species of nonhuman primates face extinction because of people. As people clear away forests, they destroy the home of the other primates. People also hunt some primates for food, kill others as pests, and capture many for research or to display in zoos.