Butterflies taste with their feet.
Butterflies taste their nests in a sense. You see, butterflies lay their eggs on the leaves of a plant, which stick to it like the stickiest glue. After the eggs hatch, the caterpillars eat not just the leaf but all the other leaves of the plant, that is, if they like the taste of it. If they don’t, they’ll starve and die. So the butterfly has to choose the plant well, making sure its leaves are tasty enough for its young to eat.