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This is a picture of a mud tunnel hanging from a floor joist in a basement. This can be one of the first signs of a termite infestation.

This type of mud tunnel occurs because the termites are trying to find a shorter way back to the colony, which is underground. They can build mud tunnels through mid-air for a short distance. If they are unsuccessful in reaching the ground, they abandon the attempt and find another way.

This image also show a six inch ruler held next to the tunnel. You will notice that this hanging mud tunnel is over 12 inches long. This is about as long as they generally get.

If you have any questions, please ask Pestdude!