This Common Loon was recovered from Mirror Lake. He had ingested fishing line, swivels, lead weights and two hooks. This x-ray was taken after a hook was removed from it's neck and the fishing line that was wrapped around it's tongue was removed.
It's scheduled for surgury to remove the other hook (arrow) and the rest of the fishing line including the swivel and lead weight. Click on the picture to enlarge it and you'll see what I'm writting about.
I like to fish and I know you can't always recover your tackel. This is a good reason to be more careful with what you can recover. There also are substitutes for lead weight also.