Slavery
Slavery is fairly widespread in ants world and takes various forms.
In Formica Sanguinea, ants organize raids into the colonies of other species and capture brood. At birth, "stolen " workers think they are in their own nest and begin to work for their new master.
In Amazon Ants, it is directly a queen that iskidnapped to spawn slaves all its life.
Finally, to found a colony, queens of certain species captured a foreign nest. For this, it kills a queen and takes its smell. Then, workers begin to raise its eggs.
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