Argynnis aglaja (4)
This large and powerful butterfly is one of our most widespread fritillaries and can be seen flying rapidly in a range of open sunny habitats. The males look similar to the High Brown Fritillary, which is far rarer but sometimes flies with them on bracken-covered hillsides. The two can be distinguished from the underwing markings, visible when they are feeding on flowers such as thistles.
I forgot my camera, so I took this picture with my cell phone :)
Location: Říp mountain - czech national mountain, where first czech tribes appeared according to the legends and ancient chronicles.