Fischer's blue
This small blue butterfly's caterpillars raised on a spreading, non native stonecrop grow into duller, less attractive adults than those raised on the native host plant.
| Where | Sunny cliffs and stonecrop habitats, East Asia |
|---|---|
| Size | 20 to 25 mm wingspan |
| When | April to October and January |
Fischer's blue is a small butterfly with uniformly black brown upperside wings, short fine tail like projections on the hindwings, and a paler underside marked with rows of black spots and small reddish patches near the tail.
Caterpillars feed only on succulent stonecrop plants growing on sunny cliffs, river banks and old walls, and the species flies in several overlapping generations from spring into autumn, with the last generation overwintering as a caterpillar.
Traits
Habitat
Heath
Colour
Black, Brown, Red
Active
Day
To people
Does not bite or sting; harmless to people.
Activity through the year
Often confused with
Told apart by the position of its red spots and by longer, more distinct tail like projections on the hindwings than the short, fine tails of Fischer's blue.
Questions
Is the Fischer's blue dangerous to people?
Does not bite or sting; harmless to people.
When can you see the Fischer's blue?
The Fischer's blue can be seen from April to October and January, by day.
Plate retouched from a photo by Юлия, CC BY 4.0, iNaturalist Licence
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Butterflies and moths›Blues and coppers›Tongeia
Last updated 2026-09-27. Every entry is checked against published sources.