So, this is what happens: a female butterfly of these Coppers and Blues will lay eggs only on vegetation where there are ants of a particular species.
The butterflies can smell, well, ants leave behind pheromones, a special chemical signal. and then the newly hatched butterflies, the caterpillars will feed on this plant after they hatch from the eggs. And it always makes its way back to the host plant to feed, guided by the ants, the ant escort service, so to speak. Uh-huh? You are onto something.