 The diet of the Bioko drill is largely dependant on their location on the island, with lowland drills primarily consuming a frugivorous diet, similar to the mainland drill, whereas drills living in more mountainous areas preferably feed on herbaceous materials such as pith, leaves and fungi, though these are significantly less nutritious.Those higher altitude drills consume a greater range of components, including the pith, stalk, flowers, seeds, leaves, and roots of a plant, rather than just the fruits.They are also capable of husking coconuts to consume them.