This undated handout photo provided by the journal Science shows Worker brood and adults of the invasive fire ant species Solenopsis invicta. Since the 1930s fire ants have spread across much of the ... more 
This undated handout photo provided by the journal Science shows Worker brood and adults of the invasive fire ant species Solenopsis invicta. Since the 1930s fire ants have spread across much of the southern US, much to the discomfort to millions of Americans. Now it turns out the stinging invaders from South America are using US as a staging ground to invade China, Taiwan, Australia and New Zealand. less 
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Associated Press | Photo By Kenneth G. Ross, Science
Sat, Feb 26, 2011 11:34 AM EST