Fischer’s Blue is a tiny Eurasian butterfly with dark wings and bold spots underneath. It lives near succulent stonecrop relatives in sunny, rocky places in Asia; it has no known native wild population in the United States.
Appearance
Appearance
The wingspan is only about 0.8–1 in (20–25 mm). The underside is dark gray-brown with bold black spots, small orange marks near the hindwing corner, and very short tails.
Where it lives
Typical habitats
sunny rocky slopes
riverbanks
stone walls
dry embankments
Range
Its range extends from southeastern Europe and the Ural region across northern Asia to Korea and Japan. U.S. observers should not expect to find a native wild population.
Preferred conditions
Colonies stay close to patches of their succulent host plants and may occupy small, isolated sites.
Behavior
Diet
Adults drink flower nectar, while the caterpillars feed on succulent plants in the stonecrop family.
Overwintering
Japanese populations as caterpillars.
Life cycle
Caterpillar food plants
In Japan, caterpillars feed on Japanese rock pine (Orostachys japonica), a small succulent rather than a true pine.