This beautiful Large Blue Butterfly (Phengaris arion) enamel pin features the insect found across Europe and East Asia. This hard enamel pin features a color palette of soft blue, bright blue, black and white. It is 1.5" from tip-to-tip and is set on a highly-polished gold-plated metal. This pin has two posts on the back. ABOUT THIS DESIGN Large Blue Butterfly caterpillars are known as brood parasites. In their caterpillar form, these butterflies resemble the larvae of the Myrmica ant. Using their resemblances, the caterpillars of this butterfly trick the ants into bringing it back to the ant nest. There, the caterpillar consumes the ant larvae or pretends to be a queen ant and feeds off of the nest's resources until it is time pupate and become a butterfly.