There are many of these butterflies visiting our garden in these days.
Since my ignorance about butterflies and every other insect is deep and total, I thought it was a Monarch butterfly, at least until I found out that they don't exist in Europe.

So I have no idea about the real name of these tireless pollinators, but they are working very hard. They are not afraid to get very close; maybe we, human beings, are too big to be perceived like a menace.
We are like rocks or heaps of wood and, since we don't produce pollen, we are deprived of interest for these flying visitors, although for reasons I cannot guess, it happens that they rest for a little while on us, every now and then.

Butterflies are self-propelled flowers