A regular visitor to my feeding station is a sparrow with a ruff at the back of his neck. It doesn't look like an injury, it looks like part of him. He has a healthy appetite and seems as busy as them all. The other sparrows don't seem to mind his being different. I haven't managed to get a photo of him, but I will keep trying. Has anyone else seen this please?
Are you sure its not a fledgeling robin?