Male Grey squirrel (Sciurus carolinensis) reproductive cycles in Britain


  • Adrian C. Dubock

    1. Department of Zoology, University of Reading, Berks, and Wildlife Research Branch, Forestry Commission Research Station, Farnham, Surrey
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    • *Imperial Chemical Industries Limited, Plant Protection Division, Fernhurst, Haslemere GU27 3JE, Surrey.


A synchronized seasonal cycle of sexual regression and development is described for the male Grey squirrel in Britain. Sexual development is maximal in December and May and minimal in August. The seasonal cycle can be overriden, but this is exceptional. Comparisons with previous work and the suggestion that the synchronized seasonal sexual cycle is general for Grey squirrels in Britain, and probably America, are made.