In 1975, the breeding season of Puffins Fratercula arctica on the Fame Islands, Northumberland, was unusually long, due to many females laying later than normal. The spread of laying was from the first week of April to the last days of June. Digging and cleaning of burrows occurred later in 1975 than in 1974: for example, on West Wideopen (see fig. 1), few burrows were cleaned before 16th April in


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