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COLILARGO Oligoryzomys longicaudatus is a species of rodent in the Cricetidae family. It lives in Chile and Argentina at less than 2000 meters above sea level, in foothills and near the water. Its name derives from the fact that it measures about 6 cms but its tail measures 11 and 15 cms. It is confused with the parakeet, which is a large mouse, like a small cat. It is of great concern in the southern region of Chile and Argentina, as it is a carrier of HANTAVIRUS and can transmit it through feces to humans, most often with fatal consequences, as immediate antidotes are required to counteract the effects.