An ant’s mandibles are the primary way in which they interact with objects, they don’t have hands or prehensile tails to grab an object. With this in mind I wouldn’t call what they’re doing with their mouths a “bite” as you and I understand it. If you’re trying to move something that’s in your way you would use your hands, if an ant encounters a blockade the only way it can try to move it is with its mouth. The only way it can attempt to break it down into a small enough piece to move is with its mouth. The only way it can know with 100% certainty that something is too hard or heavy to break or move is with its mouth.
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