It is true, it wasn’t until I heard this audio that I believed it myself. You have to listen carefully but you can hear a tapping sound this is actually termites butting against timbers as a defence mechanism when they feel threatened. If you have a severe infestation in your home you may actually hear them while you sleep. The photo here is an example of termites in a wall of a home and then taking flight and breaking through the wall, substantial damage was found at this property.