The Adonis blue is a butterfly of the Lycaenidae Family, with wingspan of about 3 cm.
It is widespread in the Paleartica ecozone, (Western Europe, Central Europe, Southern Europe, Southern Russia, Iraq, Iran, Caucasus, Transcaucasus and Turkey).
The male has the upper side wings of a bright blue sky, with a thin black line around the edge and a white margin. The female is brown chocolate with some blue flakes near the base with orange crescents towards the edges of the wings, edged with blue towards, around the edge of the rear wing.
Both males and females have a light brown underside with black spots and orange crescents.
Edge of white and brown / black checkered wings. Lower part of the front wings with a black ocellus in the cell.
The preferred habitat of Polyommatus bellargus consists of calcareous grasslands with warm and dry conditions.
This is because the larva feeds on horseshoe vetch (Hippocrepis comosa) which is largely limited to these habitats.
This plant blooms on pastures where sheep feed and disappears instead after a few years when on the cattle pastures.
Sometimes it is hybridized with Polyommatus coridon (Poda, 1761), assuming a grayish diffuse color on the underside of the anterior wings, characteristic of this last species.
The caterpillar reaches 1.6 centimeters in length, has a dark green body with dark spines and yellow bands along the back and sides.
The larvae are moderately myrmecophilous and have interactions with different kinds of ants.
Polyphagous species on different species belonging to the Fabaceae family (e.g. Hippocrepis comosa, Lotus).