"The WFA {white-footed ant] does not bite or sting, nor has it been reported to cause any structural damage. Colony population estimates vary from 8,000 to 3 million individuals (Tsuji and Yamauchi 1994). WFAs are considered by homeowners to be a nuisance pest because they are frequently observed foraging in kitchens, bathrooms, and the exterior of buildings." From
white-footed ant - Technomyrmex difficilis Forel