The butterflies do not change shape during the year. It’s about different generations emerging at different times. The first generation of butterflies overwinters as a pupa and shows itself in April. They reproduce and die. The offspring of this generation appear from July. This occurs in several butterfly species, but with the map you can see from the appearance whether you are dealing with a spring butterfly or a later generation. Since the twentieth century, climate change has even led to a third generation† These butterflies fly in September and look the same as the second generation.
Fluttering map of the country warms itself to the spring sun
