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Carpenter bees (Xylocopinae subfamily) are important pollinators, especially of open-faced flowers, though they are also known to "rob" nectar by boring holes in the sides of flowers with deep corollas (thus not accomplishing pollination). The smaller species tunnel into pithy stems to build their nests. Other species bore holes in wood and can become pests in wood construction.
There are programs for encouraging carpenter bees by supplying them with suitable nesting holes in blocks of wood.
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