The Goldfinch, Carduelis carduelis, population is on the rise https://www.rspb.org.uk/about-the-rspb/about-us/media-centre/press-releases/big-garden-birdwatch-results/ These were taken on the feeder in the garden (every garden should have one) We use sunflower hearts which attract a wide range of birds, and don’t leave messy husks around and any small pieces are cleaned up by the wood pigeons.