I still hover over mine & they've been eating duck necks since they were puppies
I cut mine into meal sized portions because I feel bad having to take food away from them. They'll eat up the bone, which is actually very good for them! It's a wonderful, natural source of calcium. The bone in duck necks is flexible cartilage, so don't worry that they'll crack a tooth or anything. But they'll eat it all up & you'll find out that there won't be anything left to take away!!
Don't be alarmed if their poopies are a little ashy the following day. That happens when they eat a bone-heavy meal. It's completely normal.