... the local human population in 1930, and left un-managed since. The data analysed in this paper were col-lected on female Soay sheep marked and recaptured in the Village Bay area of Hirta from ... size(population size, hereafter) and three weather co-variates: the North Atlantic Oscillation index (NAOhereafter; Wilby, O’Hare & Barnsley 1997), and February and March rainfall. When significant, ... 1999) and to the island of Soay in the St Kilda archipelago, Scotland, between 0 and 1000 . The studied population was moved to theisland of Hirta in 1932 following voluntary evacuationof...