Peacock caterpillar - learning butterflies in the garden

I caught a butterfly - it must have been very hungry, cos it was 'glued' to the flower - wind was shaking it back and forth, I came close to make pictures and it was still exploring the inside in the search of nectar.
With surprise I realised on the pictures, cos in reality butterflies are too small or fly away too fast, that this one is so hairy.
His name is Inachis io / Peacock caterpillar/ Rusalka pawik.
In general I don't know the names of butterflies - I am going to learn it. It is difficult to identify them - I found one very useful American website but also wiki helped a lot.

This is first 'colored' butterfly in my garden this year.