Passer domesticus – ADERYN Y TO – Breeding resident
The BTO winter atlas showed that House Sparrows were present in most 10km squares 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 over 65 birds.
The winter distribution was similar to the breeding range plotted in the 1970s.
Data collected by volunteers for the BTO. Lack, P. 1986 Atlas of wintering birds in Britain and Ireland. T & A.D. Poyser.