The rhesus macaque is one of the best-known species of Old World monkeys. The rhesus macaque is brown or grey in color and has a pink face, which is bereft of fur. It has, on average, 50 vertebrae, a dorsal scapulae and a wide rib cage. Its tail averages between 20.7 and 22.9 cm. when on the ground, they walk digitigrade and plantigrade. They are mostly herbivorous, feeding mainly on fruit, but also eating seeds, roots, buds, bark, and cereals.