Nevertheless, my attention often wandered to another of the reserve’s primates—the troop of long-tailed macaques (Macaca fascicularis). These slender monkeys with variegated green fur and ...

Researchers spent two years documenting the island’s wildlife through a variety of methods — and their efforts paid off.

The island has one well-known macaque troop which “stays near the road and residential areas as humans intentionally leave food items,” but the other troops were “very well hidden in the ...