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is xanax good for high blood pressure Argentine ants living in vast numbers across Europe, America and Japan belong to the same inter-related colony, and will refuse to fight one another. The colony may be the largest of its type ever known for any insect species. Argentine ants were once native to South America, but people have unintentionally introduced the ants to all continents except Antarctica. In Europe, one vast colony of 600 billion Argentine ants is thought to stretch for 6,000 km along the Mediterranean coast, while another of 90 billion extends over 900 km along the coast of California. A third huge colony of 300 million ants exists on the west coast of Japan. Together they are about as brainy as 2,000 humans.