Chalkhill Blue (Lysandra coridon)
Hertfordshire, England, 1984

Chalkhill blues can still be found on Therfield Heath, near Royston.

This small butterfly lives only on closely grazed chalk grassland, which provides the right conditions for its foodplant, the horseshoe vetch. The caterpillars secrete a sweet substance which is attractive to ants.

Chalkhill Blue