The Winter Atlas showed that Barn Owls were recorded in 14 out of 27 of the county’s 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 3 birds recorded in a day.
This species can be difficult to detect in the winter when it is mainly nocturnal and silent, which despite being a resident, has resulted in a 40% lower registration than in the 1970 breeding atlas survey.
LACK, P.C. (1986) The atlas of wintering birds in Britain and Ireland. T. & A.D. Poyser