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Leaf cutter ants:
Leaf cutter ants are a superb example of an obligate mutualism. The ants, which live in colonies of up to five million individuals, depend on a species of fungus that is found nowhere but in leaf cutter nests. The ants cut and bring huge amounts of leaf matter into their nests, which serves as a substrate for the fungus. The ants feed bits of the fungus to their developing larvae.