The Karner Blue butterfly is an endangered insect about the size of a postage stamp. The coloring of the male and female butterflies is different. The upper side of the male is silvery or dark blue with a thin black border, while the female's wings are more grayish brown with a border of irregular orange crescents. Their undersides are gray with a continuous band of orange crescents along the wing edges and scattered black spots that are circled in white. These butterflies produce offspring twice a year with the first caterpillars hatching in April. Karner Blue caterpillars eat only wild lupine leaves, while adult butterflies feed on the nectar of flowering plants.

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