Lycaena phlaeas, the small copper, American copper, or common copper, is a butterfly of the Lycaenids or gossamer-winged butterfly family. According to Guppy and Shepard, its specific name phlaeas is said to be derived either from the Greek phlego, “to burn up” or from the Latin floreo, “to flourish”.
It is widespread and common across Europe, Asia, and North America, and also found in North Africa south through to Ethiopia.
In bright sun it is a very active little butterfly with the males setting up small territories which they will defend vigorously against rival males or indeed any unlucky passing insect. Even the shadow of a large bird passing overhead is enough to elicit a response. Females are pursued and mating usually occurs in vegetation.
Source and more info: Wikipedia