Narrow tunnels made of soil and saliva that subterranean termites build to travel between the ground and a food source while staying protected from open air.
The termite's protected travel route
Subterranean termites need moisture to survive and can't tolerate open air for long, so they build pencil-width mud tubes along foundation walls, crawlspace piers, or siding to travel safely between the soil and the wood they're feeding on.
Why mud tubes are one of the clearest termite signs
Mud tubes are one of the most visible, reliable signs of active subterranean termite activity. Finding them on a foundation wall is a strong reason to get a professional opinion promptly, since damage is often already underway by the time tubes are visible.
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