Two weeks later, adult Karner Blue butterflies emerge. They live for about 10 days. The adult Karner Blue is about the size of a quarter. The top of a male Karner Blue's wings are solid blue with a black and white border. The female's wings are blue in the centre and brown along the outer edge.
Females also orange moon-shaped markings along their wings' outer edge.
These delicate butterflies move only a few hundred meters a day, and live in one area for their entire short life. You will never see a Karner Blue out in the rain. While they don't mind wind and clouds, the butterfly prefers warm temperatures, and is inactive when it rains. The butterfly can no longer be found in Canada, and has been on the American Endangered Species list since 1992. The greatest threat to the butterflies has been loss of habitat.