[Drywood Termites][1] construct a virtual city within the wood. They carve out galleries in wood beams and use tunnels to move from place to place. They also swarm annually to start new colonies.
[1]: https://trulynolen.com/termite-control/drywood-termites/
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Attic and eave areas - These are prime targets for swarmers in search of a nesting location, as are windowsills, baseboards, beams and door frames.
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Cracks in wood - TA swarming termite can enter a structure by penetrating the smallest crack of imperfection in the wood.
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Furniture and other materials - Drywood termites can also be introduced into an environment through infested furniture or construction materials.