Japanese macaques range in color from shades of brown and gray to yellowish brown. They have a colorful face and posterior end that are pinkish red in color. Their fur is very thick, which, because they do not hibernate, helps them stay warm during harsh winters. They have a short stumpy tail. Japanese macaques express sexual dimorphism; males are generally taller and more massive than females. Males average 11.3 kg in weight and 57 cm in height. Females average 8.4 kg in weight and 52.3 cm in height. There also seems to be a correlation between the body weight of Japanese macaques and climate. Japanese macaques in southern areas generally weigh less than those in northern areas of higher elevations, where more snow is present during winter months. Provisioned Japanese macaques have a larger skull than non-provisioned macaques. The skull of provisioned Japanese macaques averages 134.4 mm in length for males and 118.1 mm for females. The skull of non-provisioned individuals are slightly reduced, averaging 129.5 mm in males and 115.8 mm in females.
Average mass: male 11.3 kg; female 8.4 kg.
Average length: male 57 cm; female 52.3 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger
Average mass: 8882.5 g.