Pagai Island Macaque—Critically Endangered
This is the Pagai Island macaque (Macaca pagensis)! With a group size of 5 to 25 individuals, the Pagai Island macaque troop consists of one adult male and several females, along with infants and juveniles. These one-male-multiple-female groups are often referred to as harems. Adult males that do not have their own harem are solitary and will often challenge harem leaders in order to gain females for themselves. These challenges can result in aggressive fights and injury. The male leader of a harem is dominant to all other members and will communicate this to group members through loud, high-pitched calls.
When foraging, the troop will split into smaller groups but still tend to migrate in close proximity to other small groups. They have been known to have a commensal association with Mentawai langurs (Presbytis potenziani) and pig-tailed langurs (Simias concolor), foraging alongside the two species. They are a diurnal species, meaning they are awake during the day, with the exception of naps, and sleep during the night. They are known to sleep in small groups, similar to how they forage. Learn more: https://neprimateconservancy.org/paga...