Ants leave a pheromone trail behind them wherever they go. This helps them find their way back and tells others where they went. When this trail gets interrupted, they get lost until they find it again.
Occasionally ant colonies will merge if there is plenty of food to go around and nothing agitates them, but usually foreign ants are driven off or killed.
Phawk-uffe t1_iqr5s3u wrote
Reply to How do ants find their way back "home"? by DanieleJava
Ants leave a pheromone trail behind them wherever they go. This helps them find their way back and tells others where they went. When this trail gets interrupted, they get lost until they find it again.
Occasionally ant colonies will merge if there is plenty of food to go around and nothing agitates them, but usually foreign ants are driven off or killed.