I've had this bone for ages but it's only been this week when I've worked out exactly what it is. It's the strangest bone I think I have because me and dad couldn't find any other pictures of it at all.
Years ago, me Mum and Dad were in the Pheasant woods, and I think it was the first time we were ever in Duck Skull Valley. Duck Skull Valley is a valley between three sets of woods which is great for watching roe deer in the winter. It has a small lake in the middle, and I was exploring the lake when I found a duck skeleton right next to it with all the bones in a pile.