Rhesus monkeys, scientifically known as Macaca mulatta, are medium-sized primates native to South Asia. 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. Rhesus monkeys are social animals that live in troops, which can consist of up to 100 individuals. They communicate through vocalizations, facial expressions, and body language. These monkeys are also known for their intelligence and have been widely used in scientific research, particularly in studies related to human health and behavioral science.