Thanks!
Wasn't sure what species the flower is, the closest fit I could find was a rockrose (Helianthemum nummularium). Funny enough, in German it's called "Sonnenröschen" which translates as 'little sun rose' & would fit my picture perfectly.
But your poppy hint gave me the clue I needed. It's more probably a yellow horned poppy (Glaucium flavum).
Birds are very intelligent. They know, as long as that strange guy is on the bike, there is no danger, but when he gets off, nobody knows what might happen.