Skelly or shellapple?
If you had lived a century ago, you might have used one of a score of dialect names for the chaffinch, such as caffer, caffincher, cavenger, chaffer, chiffey, bullspink, scobby, skelly, spink, twink, pink, shellapple, shelly, shilfer, wet bird, buckfinch, beechfinch, whitefinch, copperfinch or horsefinch.