From MySabah.com Blog:
I had seen proboscis monkeys in Klias Wetland, Kinabatangan and Lokkawi Wildlife Park. The Labuk Bay Proboscis Monkey Sanctuary in Sandakan is one of the best spots to see them. During the feeding time at 11:30am and 4:30pm, you can a few families (about 30) of them come for the food.
BTW, you also can see many Silver Leaf Monkeys around that area. The people here also call them “Beckham” monkey (probably Beckham looks like them). Proboscis Monkey has nicknames such as “Long-Nosed Monkey” and the “Dutch Man.” The male has bigger nose than the female, and they use their big and long noses as a sex tool to… to… to attract the female. I wonder how do they kiss huh.
Continue reading (incl. pics) at: Proboscis Monkey