Mergus merganser – HWYADEN DDANHEDDOG – Scarce winter visitor. Not recorded in April, May, July and August
The BTO winter atlas showed the 10km squares where Goosanders were recorded during the winters of 1981-82, 1982-82 and 1983-84.
The darker the colour, the higher the relative total count for each 10km square. The darkest blue represents 4-10 birds seen in a day.
Data collected by volunteers for the BTO. Lack, P. 1986 Atlas of wintering birds in Britain and Ireland. T & A.D. Poyser.