Abstract
Eggs of the Cory's ShearwaterCalonectris diomedea borealis of Selvagem Grande (Madeira, 30°09′N, 15°52′W), show high variability in size and shape between females, while for each individual both are correlated over two seasons. During the first breeding years, females lay larger and more rounded eggs as their experience (number of years since first breeding) increases. Age (number of years since birth) probably has an effect on egg size but adult size has none. No important differences between the two years of study has been observed and no inter-colony variation is apparent. Finally, breeding success is directly linked to egg size but not to egg shape.
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