HOUSTON (AP) — New research indicates voracious fire ants accidentally imported to the United States in the 1930s are harming the recovery of endangered prairie chickens in Texas.Attwater Prairie Chicken National Wildlife Refuge manager Terry Rossignol says initial findings released Thursday indicate treating for insect-devouring fire ants allows other bugs to thrive, increasing the survival rate of the Attwater chicks. He says this research could also be promising for other wildlife harmed by fire ants.Rossignol says the lack of insects hurt the chicks' survival rate. In 2009, the U.S. Fish and Wildlife Service lay fire ant traps in a 760-acre area. It found there two times more and twice the variety of insects then untreated areas.And in 2011 the refuge counted 82 birds, the most found there since 1990.