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insects do not digest the wood or other medium itself, but bore tunnels in which yeasts or other fungi grow, possibly stimulated by excretions and secretions of the insects. Such tunnels obviously cannot be permitted to become clogged, or the insects could not access their own pastures, so they must either eject at least part of their frass, or otherwise leave room for the edible growth. Examples of such boring-insect/fungal associations include ambrosia beetles with ambrosia fungi,

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