Tunnels in Wood
Carpenter ants tunnel through wood for shelter but do not eat it as termites do. Termite infestations are typically more destructive to wood. Termites leave chewed wood, excrement and soil in their tunnels, whereas ants keep their tunnels very clean.
Termites Above Ground
Termites and some ants also construct tunnels above ground, according to PestCemetery.com. Termites use a mixture of their saliva and feces to glue together soil particles to construct tunnels that vary widely in size and can be quite elaborate.
Ants Above Ground
Some ants like fire ants build tunnels above ground. They are usually no more than 8 inches high and less sturdy than termite tunnels. Ants do not "cement" these tunnels like termites, so they usually build them on brick or cement for support.