Ants expel things from their anus to find things to find their way.

Ants know the route by smell and the direction by sunlight.

Antennas of ants are more spiritual than bamboo poles of the blind. Because this has two effects on the tentacles: one is the tactile effect. Through the contact between the tentacles and the outside world, we can find the outline, shape and hardness of the object in front, as well as the terrain ups and downs of the road ahead. This effect is exactly the same as that of a blind stick. The other is the sense of smell, which is used to identify. This is what the blind bamboo pole does not have. It turns out that while walking, ants will constantly secrete a small amount of chemicals with special smells from glands at the end of abdomen and legs, which are called marking substances, and will leave traces after being polluted on the road. The ants in the same nest are far away from the nest, and when they return to the nest, they use their special noses-tentacles to smell the smell road signs. This is the so-called "olfactory navigation". Wipe the ants with your fingers several times on the way home to destroy their original chemical smell road signs, or put a sanitary ball to make the smell of the sanitary ball cover up the smell of the marked substance. At this time, you will see many ants climb to this place, stop moving at once, and make a mess on the spot. Because they couldn't smell the original smell for a while, they temporarily lost their way. If you continue to observe, you will find that before long, they touch each other with their tentacles, as if whispering to each other: "The road sign ahead is broken, and we must do something quickly." They stopped and went around in circles. Finally, they will try to bypass the scent line and re-establish a new route back to the nest.

How do ants rebuild new landmarks? Generally, another positioning method is adopted. That is, according to the position of the sun, using polarized light in the sky to navigate, also known as astronomical landmarks. This secret was discovered by French entomologist Fabers a long time ago. Ants' eyes are natural polarization navigators. Foraging ants can go home accurately by identifying the direction of the sun and counting the steps.