Opportunistic predation and predation-related events on long-tailed macaque and proboscis monkey in Kinabatangan, Sabah, Malaysia

We report two cases of predation and predation-related events on long-tailed macaques and proboscis monkeys living in sympatry in the lower Kinabatangan, Sabah, Malaysia. An adult male Long-tailed macaque was preyed on by an estuarine crocodile while feeding on fiuits at low tree branches above the river. We found a solitary male Proboscis monkey who has large wounds on the cheek and left thigh. It would appear that the male was injured by a large predator such as a Sunda clouded leopard. These cases indicate the strong predation pressure on primates who habit in riverine forest as previously indicated. For better understanding of anti-predation strategies among primates, more information on predation events is necessary.