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the habit in some animals of eating only certain kinds of food. Oligophagous animals are contrasted to monophagous ones, which consume only one kind of food, and to polyphages, which consume many kinds of food. Oligophagy is characteristic of arthropods, including insects, spiders, ticks, mites, and crustaceans. Oligophagous worms, mollusks, fish, and birds can be insectivorous, granivorous, carnivorous, piscivorous, or bird-eating; oligophagous mammals can be herbivorous, frugivorous, or nectarivorous. Oligophagous animals are widely distributed in tropical forests but are comparatively rare in temperate and high latitudes.