Lawmakers advanced a bill Wednesday that approves a study of and elimination of the little fire ant.  The ant has a stinging bite, and it threatens the state's economy and ecology. House Bill 2469 would provide more than $500,000 toward coordinating efforts to corral and destroy the little fire ant. It includes money to pay for trained dogs to sniff out the tiny pests and for public outreach. They live in trees, where they infest crops and bite agricultural workers. They also live on the ground, where they attack people and pets, perhaps partially blinding cats and dogs by stinging their eyes. A single square foot of infested ground can contain 2,000 ants.