Just a simple caterpillar, but I liked its colours.
By chance I saw a photo with an identical worm and so now I know it is the larva of the butterfly Papilio machaon, and that it can, if it’s annoyed, to expel an irritating liquid as defence against birds. Luckily it knew I’m not a bird.
And I had got a photo of the butterfly as well, three months before. This is a Papilio machaon as well, adult version.