Ant is an insect with a very sensitive sense of smell, and its olfactory organ is antenna. You may have noticed that when ants meet, they will touch each other with their tentacles, and then they will pass each other by. When they walk, they also leave some smells on the ground. It is through these smells that they recognize each other and the way home.

Someone did an experiment. After cutting off the tentacles of ants, they will become "headless flies", running around and not recognizing their "comrades-in-arms". Even if one of them bumps into one of their own, they can't recognize the way home.