Formosan rock macaque Formosan rock macaque The Formosan rock macaque ("Macaca cyclopis"), Formosan rock monkey, or Taiwanese macaque, is a macaque endemic to the island of Taiwan and has been introduced to Japan. Besides humans, Formosan rock macaques are the only native primates living in Taiwan. Rock macaques measure 50–60 cm and weigh 5–12 kg, generally females are smaller. Their tails are moderately long and measure 26–45 cm. This macaque is brown or gray in color. Like all other macaques, it has specialized pouch-like cheeks, allowing it to temporarily hoard its food. The gathered morsels are eaten sometime later, in safe surroundings. Among
Lion-tailed macaque other macaques, it avoids humans. In group behavior, it is much like other macaques; it lives in hierarchical groups of usually 10 to 20 animals, which consist of few males and many females. It is a territorial animal, defending its area first with loud cries towards the invading troops. If this proves to be fruitless, it brawls aggressively. Lion-tailed macaque behaviour is characterized by typical patterns such as arboreal living, selectively feeding on a large variety of fruit trees, large interindividual spaces while foraging, and time budgets with high proportion of time devoted to exploration and feeding. It primarily eats