Definition of chalkhill blue in English:
A European blue butterfly of calcareous grassland, of which the male is silvery-blue with blackish markings and the female is brown.
- Lysandra coridon, family Lycaenidae
- Cockey Down is best visited in spring and summer, when insects such as the hornet robber-fly, and butterflies such as chalkhill blue, marbled white and dark green fritillary find a home among the stunning tapestry of wildflowers.
- Chalk downland has several butterflies found nowhere else, and the chalkhill blue is one of these.
- Butterflies include species such as the small and chalkhill blues, brown argus and the marbled white.