They're from Peru. They're ceramic. They're hand painted. Drilled back to belly. Approximately 1 inch long. They really are more common than you think, they often mix with mallard hens and since they look like them, they blend. But maybe it's a Loon, maybe my bird ID skills aren't what they should be. Some of the PCB holes will take a 2mm cord, some just close to a 2mm cord.