Male Common Blue Butterfly
As a caterpillar, the common blue eats leaves. As an adult butterfly, it feeds on wildflower nectar and excrement. The adult lives for 3 weeks.
Males are often very obvious as they defend territories against rivals and seek out the more reclusive females. In the south of Britain, there are two broods a year, flying in May and June and again in August and September. Northern England has one brood, flying between June and September. In a year with a long warm season, there is sometimes a partial third brood in the south flying into October.