Nepenthes bicalcarata, also known as the fanged pitcher-plant, is found only in Borneo. The purpose of the fangs has long been debated among botanists. They have been thought to deter mammals from reaching in and stealing the contents of the pitcher, though the more intelligent mammals like monkeys have been observed tearing open the side of the pitcher to get to drowned insects. Other botanists suggest that the fangs, which secrete nectar, serve to lure insects into a precarious position over the pitcher mouth, where they may lose their footing and fall into the pitcher fluid, eventually drowning and becoming food for the plant.