Argentine Ant

Linepithema humile, a dolichoderine ant, measures 2.2–2.8 mm, displaying a uniform light-brown coloration, lacking the characteristic acidopore of formicine ants. Queens are morphologically similar to workers but larger (4-5 mm), with a more robust mesosoma for egg production. Colony reproduction is primarily by budding, where one or more queens, accompanied by workers and brood, migrate to establish new nests, bypassing nuptial flights typical of many ant species. A queen can produce up to 60 eggs daily, contributing to rapid colony growth. Workers live for several months, while queens can survive for multiple years, maintaining sustained reproductive output. These ants thrive in a temperature range of 15–30 °C with moderate to high humidity; extreme temperatures and arid conditions limit their distribution.

Argentine ants are active both day and night, though foraging peaks in early morning and late evening, adjusting to environmental temperatures. They exhibit cooperative polydomy and polygyny, forming intricate supercolonies that can span vast geographical areas and contain millions of workers and thousands of queens, reducing inter-colony aggression within these expansive networks. Dispersal primarily occurs through 'budding,' which is often facilitated by human activity, allowing them to rapidly colonize new areas. Communication involves sophisticated trail pheromones, laid from the Gaster, allowing efficient recruitment to food sources and the establishment of persistent foraging trails. Their aggressive displacement of native ant species and symbiotic tending of honeydew-producing hemipterans, particularly aphids and scale insects, significantly impact local ecosystems and agricultural productivity. Human structures can suffer aesthetic damage from foraging trails and minor electrical issues if ants nest within appliances.