Long-tailed primates, commonly known as monkeys, are a group of mammals that are found in tropical and subtropical regions around the world. They are characterized by their long tails, which are used for balance and communication, and their dexterous hands and feet. Monkeys are highly social animals, living in large groups and engaging in complex behaviors such as grooming and play. They are omnivorous, eating both plants and animals, and have been observed using tools to obtain food.