ST. JOHNS RIVER, Fla. – It may look like a pile of dirt. Or floating debris on top of the water. But if you look closer, it’s actually a mound with thousands of aggressive and venomous fire ants.

Look, up in the sky. It’s a bird! It’s a plane! It’s a... fire ant? OK, fine, fire ant queens are probably way too small to see when they’re 400 feet above the ground, but flying is a vital part of ...