When I was in Bali (Indonesia) recently, like many tourists, I visited the Ubud Monkey Forest; also called the Sacred Monkey Forest Sanctuary. This relatively small (10 ha) site, as the name suggests, is famous for its monkeys. Officially known as Crab-eating macaques (Macaca fascicularis), these monkeys are also called long-tailed macaques or locally, Balinese long-tailed monkeys. The monkeys are…