Alcon Large Blue
is a critically endangered butterfly species. For its life it requires gentian and a certain species of ants. Females lay eggs on gentian flowers from July to August. The hatched caterpillars get into the ovary which they consequently eat away until they fall down under the plant. Here they wait until ants carry them into the anthill to be fed. In the spring of the following year the larvae pupate and in July the newly hatched Alcon blues leave the anthill.