Rhesus macaques are medium-sized primates native to South Asia, particularly found in countries like India, Nepal, and Bangladesh. They have a distinctive brown or gray fur, a short tail, and a face with a pinkish hue. These monkeys are highly adaptable and can thrive in various habitats, including forests, grasslands, and urban areas. Known for their intelligence and social behavior, rhesus macaques live 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, particularly in studies related to psychology and medicine.