Evolution is usually a forward-moving process, honing every single living thing to perfectly fit its environment. But even this steady march of biological progress isn't a universal truth, at least not for the humble turtle ant, which experiences what scientists call "reverse evolution." A published in the Proceedings of the National Academy of Sciences (PNAS) studied the turtle ant caste system, the natural order these ants maintain to create functioning social order. Researchers found that those belonging to the soldier caste have developed a “head shape and size…specialized for nest...…Evolution is usually a forward-moving process, honing every single living thing to perfectly fit its environment. But even this steady march of biological progress isn't a universal truth, at least not for the humble turtle ant, which experiences what scientists call "reverse evolution." A published in the Proceedings of the National Academy of Sciences (PNAS) studied the turtle ant caste system, the natural order these ants maintain to create functioning social order. Researchers found that those belonging to the soldier caste have developed a “head shape and size…specialized for nest...WW…