 The drill diet may also consist of wood and mushrooms, the latter of which is rare in a primate.Bioko drills are also known to consume animals, including most commonly; beetles, land crabs and other crustaceans, millipedes and hymenopterans, a class that includes ants, flies, wasps, and the African giant snail.In one instance, the remains of rodents and frogs were found in faecal matter of a drill, and they have also been noted to forage for marine turtle eggs on beaches.