Teenage birds are just like human ones - except that humans don't have quite the equivalent of sparrowhawks winging around. This teenage chaffinch simply sat on the wall, in full view of everyone, and waited for dinner to be brought by his two, frantic parents. They had probably told him over and over again that this was about the most stupid thing he could possibly do but.... well, he's a teenager.
This teenage goldfinch took a slightly different approach to ensuring that a square meal was delivered, alternately sitting, looking cute and helpless, and waiting for parents to reappear, and....
He sat on a branch of the buddleia for about a quarter of an hour to recover, while his anxious parents kept vigil at his bedside. He recovered quite suddenly, and flew off with his mum and dad in hot pursuit.
Many thanks to Gael Cameron for the picture of the nestlings.