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.

You can see this image with a little more perspective by clicking HERE .

If you have any questions, please ask Pestdude!