- Scientific Name: Lycaeides melissa samuelis
- Appearance: Their wingspan is about 1 square inch for males and females. However, their coloration changes between male and female. Male butterflies are deep blue with a thin black border. Female butterflies are blue with orange spots on a grey-brown border.
- Range: They are found in the northern lupine range, due to their dependence on the flower. They are now found mostly in Wisconsin; however, they were once found in Indiana, Michigan, Minnesota, New Hampshire, New York, Illinois, and Ohio.
- Why they are disappearing: Habitat loss due to land development is causing the Karner Blue Butterflies to become endangered. They are completely dependent on the growth of lupine and flowering plant growth; without large fields of these flowers, the butterflies are left without a habitat.