The sunflower is now slowly drying, all the heads full of seeds. But when it was still in bloom, I encountered on it this beetle, one that I have never seen before. I have recognized that it is a member of the family Cetoniidae (flower chafers) but that was it.
I think that it is mediterranean spotted chafer Oxythyrea funesta, which was preliminarily confirmed to me by an actual active biologist. In that case, it is a rare sight because the beetle is rare in Czech Republic and is protected by law.