I was really lucky to made a photo of this superb butterfly. I have seen it many times flying, but is shy and very quick.
https://en.wikipedia.org/wiki/Scarce_swallowtail
clover field, July 2017, South Bohemia, Trebon region, Czech republic
Pentax K50 f 8; 1/400 sec; ISO 400; lens zoom 3,5-5,6/18-55 mm
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From @valtr