Ouch! What happened?

Settling down to watch the news this evening and I heard a mild thump on the window.  Turns out this wee chap must have given himself a big fright when he flew into it.  He sat dazed on the deck for a few moments before managing to fly up to the relative safety of the big tree at the front. He must have been a bit upset as he didn't once chirp for mum to come and see him.  Poor wee thing.