This is because ants leave a chemical trail for other ants to follow.
They are following a trail laid out by another ant that will take them to food, water or their home. Ants leave this trail of pheromones or scent as they travel. After finding food they return to the nest (following their own scent trail) and communicate this fact to other ants who then follow the scent trail to the food. As more ants travel the trail the scent gets stronger (easier to follow) and the random bumps are smoothed out making the trail straighter.
They are following a trail laid out by another ant that will take them to food, water or their home. Ants leave this trail of pheromones or scent as they travel. After finding food they return to the nest (following their own scent trail) and communicate this fact to other ants who then follow the scent trail to the food. As more ants travel the trail the scent gets stronger (easier to follow) and the random bumps are smoothed out making the trail straighter.
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