Argentine ant
Linepithema humile (Mayr)
The World Conservation Union lists Argentine ant as one of the world´s 100 worst invasive alien species. The Argentine ant forms 'super colonies' which are difficult to control, and impossible to eradicate with usual ant poisons. The ants are known to swarm in their thousands through buildings, and are small enough to get into electrical fittings and even the fridge, causing a major headaches for households. The Argentine ant originally established in Auckland about 15 years ago, and is now a big problem for homeowners in many suburbs there. More recently it has turned up elsewhere in the North Island, Nelson, and Christchurch.
Most infestations are in urban areas, as the ant hitches a ride in freight, potted plants, rubbish, vehicles and other such goods. However, many natural areas are also at risk, and an infestation has been found on Tiritiri Matangi Island in the Hauraki Gulf, a highly valued open sanctuary and scientific reserve, containing many species of bird only found on offshore islands.
Argentine ant workers are about 2.7 mm long and are a uniform honey brown colour. Foragers move steadily in defined continuous trails that can often be seen going up trees or shrubs, especially if they are flowering. The ants can't sting but some people react to their bite.
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| Worker | Queen | Male |
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