A Survey of the Distribution of the American Grey Squirrel (Sciurus carolinensis) and the British Red Squirrel (S. Vulgaris leucourus) in England and Wales in 1944-5

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Abstract
In a questionnaire survey conducted in 1944-45, 77% of the total number of parishes in England and Wales and 96% of the 10 km. grid squares were covered. The grey squirrel was found to be present in 45% of the grid squares. In 1937 it was found in only 274 grid squares compared with 708 grid squares in 1944-45. 112 new squares have been added on the western boundary of the distribution. The eastern boundary of the grey squirrel has not changed markedly from the 1937 position. The reason for this limit is not known. The red squirrel was reported from 64% of the total grid squares covered. The red squirrel is present in 19% more grid squares than the grey squirrel. The red squirrel appears to be more widely and thinly distributed. Of grid squares occupied by the grey squirrel in 1930, 66% now have no grey squirrels. 25% of the total grid squares covered now contain both spp. Absence of squirrels of both spp. was reported for 16% of the grid squares. The apparent causes for the absence of squirrels were found to be lack of sufficient trees in fen, moorland, coastal or heavily industrialized areas.

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