Hospital-pest
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Monomorium pharaonis
Pharaoh Ant
Monomorium pharaonis, commonly known as the pharaoh ant, is a small (approximately 2 mm) yellow to light brown invasive ant species of unknown origin that has become one of the most widespread and problematic indoor pest ants globally. It is a highly polygynous, unicolonial species with colonies containing multiple queens, workers, males, and brood. The species exhibits pronounced caste polyphenism with distinct morphologies and behaviors across queens, workers, and males. Pharaoh ants are notorious for infesting hospitals, food service facilities, and residential structures, where they pose significant public health risks as mechanical vectors of pathogens. Their complex social structure, involving multiple reproductives and decentralized nest sites, makes them exceptionally difficult to control using conventional insecticide treatments.