Chalkhill Blue

Latin name: Polyommatus coridon

In the male, the dorsal face of the fore-wings are silver-blue with hints of green, edged with black edges and a white fringe, interrupted by black. The female has brownish-grey wings, the hind wings with a row of semi-circular orange spots. The underside of the wings is grey in males and brown in females, the underside of the rear wings covered with characteristic spots. Flight period is July-August, preferring dry meadows with low vegetation, on stony or limestone soils. The butterflies feed on nectar from various plants, preferring Devil’s Bit scabious, Marjoram (Origanum vulgare), or thistle species. Sometimes, in the evening, the butterflies gather in groups to overnight. Males can be found on damp soil or sand, from where they extract mineral salts. Over-wintering is in the egg stage. Larvae develop in May-June on clover species (Trifolium spp.), milk-vetch (Astragalussp.), or crown-vetch (Coronilla varia). The species pupates at the end of June under rocks or soil. Intensification of grazing,fertilization of grasslands, and alteration or destruction of habitats are the principal factors endangering the species. It indicates natural grasslands with shorter grass and high quality pasture.

Wing span: 28-32 mm

  • Flight period
  • Egg period
  • Larva period
  • Pupa period

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