The rhesus macaque is a medium-sized primate native to South Asia, particularly found in countries like India, Nepal, and Bangladesh. They have a distinctive brown or gray fur, a long tail, and a face with a pinkish hue. Rhesus macaques are highly adaptable and can thrive in various habitats, including forests, grasslands, and urban areas. These monkeys are known for their social behavior, living in troops that can consist of up to 100 individuals. They communicate through vocalizations, facial expressions, and body language. Rhesus macaques are also significant in scientific research, contributing to studies in psychology, medicine, and genetics.