Red ants, also known as fire ants, can be a nuisance because they build their colonies in places like gardens, farms, backyards, and other moist places. They do not bite human beings unless disturbed. If the ants feel threatened by you in some way, they will bite, leaving you with bites all over your body. Thus, they can become major troublemakers in your gardens as they build big colonies full of thousands of ants.