Have, what appears to be, a mutated junco at my feeder. Same size, grey above, white below appearance of a junco but its cap is white.
Any bird can have albinism - partial or full.
Some have only one or two white feathers, or an entire white body part. Total albinism is rather rare. Same size, grey above, white below appearance of a junco but its cap is white. Some have only one or two white feathers, or an entire white body part. Total albinism is rather rare.