This is Bill. He’s a Mallard drake and few years ago he suffered a massive trauma to his bill. How this happened is not known but fellow RedBubbler duck370 found him haemorrhaging blood. Despite his horrific injury Bill made a complete recovery, all be it with a nasty disfigurement. Looking on the positive side, from my perspective, he is an immense and highly visible character, so much so that I regularly seek him out and feed him. He’s a grand little character!
Look at duck370’s work, it’s awesome.