Argentine Ant Triumphs Over Pesticides In California

02/14/2011 12:26 pm ET | Updated May 25, 2011

In 1907 Argentine ants (Linepithema humile) arrived in Los Angeles via a cargo ship. Within just a few years of their arrival the six-legged stowaways formed a single, massive colony--known as a supercolony--that stretched through California from south of the Mexico border to San Francisco.