Labuk Bay Sanctuary is home to around 150 wild, free-ranging proboscis monkeys living in mangrove forests. In the mid-1990s, when the area was set to be cleared for oil palm, the owner discovered the monkeys and decided to preserve this forest as a sanctuary. The monkeys are distinguished by their distinctive large noses and can be observed up close during feeding times from two observation platforms. Besides proboscis monkeys, silvered leaf monkeys, other primates, and birds can also be spotted. The private sanctuary is located 38km from Sandakan.