Holly Blue Butterflies can mainly be seen in the Midlands and in the north of England in early spring and it is not uncommon to see two generations of Holly Blue Butterflies in a year.   They are often seen in parks, gardens and in the countryside   As a butterfly, the Holly Blue Butterfly lives for about twenty-one days.

The Holly Blue Butterfly is easily recognised because it has lovely pale blue wings which are sparsely covered with small black spots.   The underside of the wings is a paler blue colour with lots of small black spots.   The Holly Blue Butterfly has two long antennae that have white stripes running across them.

Holly Blue Butterflies often lay their eggs on the flower buds of holly.  A small light green caterpillar with a pink stripe running across its body emerges from each egg.  The caterpillar forms a chrysalis by spinning a silk case around itself.  Inside the chrysalis the caterpillar transforms itself into a beautiful Holly Blue Butterfly.