I enjoy watching birds. I know many common species by sight, flight and sound. Perhaps that is why, when something out of the ordinary occurs, I notice immediately. I've seen birds with missing tails or one leg or one half of the beak missing.
I noticed this chap yesterday with an interesting piebald addition to his usual robin colouring. Happened to look out the window this morning and there he was again.
Took me a moment to notice him amongst the rocky ground so maybe this anomaly in colour is to his advantage.