The Formosan macaque (Macaca cyclopis) is a macaque species whose primary habitat is Taiwan’s evergreen forests; it is strongly terrestrial and diurnal. Its diet is broad, including fruits, leaves, seeds, insects, and small animals, and it temporarily stores food in cheek pouches. Males have a body length of 40–55 cm and females 35–45 cm; body weight ranges from 6 to 18 kg, and the tail measures 25–35 cm. Groups are multimale–multifemale and can reach up to 100 individuals, though human activities have caused some groups to become smaller. Reproduction is seasonal: mating occurs from November to January, gestation is about five months, and usually a single offspring is born. Population trends are stable and the species is classified as Least Concern, but in Japan past escapes have led to invasive species problems in some areas.