Most monitor lizards are almost entirely carnivorous,[17] consuming prey as varied as insects, crustaceans, arachnids, myriapods, molluscs, fish, amphibians, reptiles, birds, and mammals. Most species feed on invertebrates as juveniles and shift to feeding on vertebrates as adults. Deer make up about 50% of the diet of adult Komodo dragons, the largest monitor species.[18] In contrast, three arboreal species from the Philippines, Varanus bitatawa, V. mabitang, and V. olivaceus, are primarily fruit eaters.