Ants are useful for clearing out insect pests and aerating the soil. On the other hand, they can become pests when they invade homes, yards, gardens and fields. Carpenter ants damage wood by hollowing it out for nesting. Nests may be destroyed by tracing the ant trails back to the nest, then pouring boiling water into it to kill the queen.
Ordinary chalk can be used to keep ants at bay; drawing a line or circle around the protected area may prevent them from entering.
In some parts of the world large ants have been used as sutures (stitches) by pressing the wound together and applying ants along it. The ant in defensive attitude seizes the edges in its mandibles and locks in place. The body is then cut off and the mandibles can remain in place for up to three days closing the wound.
Some species, called killer ants, have a tendency to attack much larger animals during foraging or in defending their nests. Human attacks are rare, but the stings and bites can be quite painful and in large enough numbers can be disabling.
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