Abstract
In the Cory's Shearwater Calonectris diomedis boreadis breeding on Selvagem Grande (30d̀ 09'N, 15d̀52'W), mate fidelity averaged 71.4%. Two‐thirds of the changes were the result of the absence of the former mate and one‐third only, carried out in its presence, were true divorces. The rate of divorce and the rate of replacement of an absent former mate had increased since the beginning of the 1980s. Among young and inexperienced birds, the rate of divorce decreased with the increase of age and experience before becoming stable. Breeding failure during the previous year increased the probability of divorce. Temporary non‐breeding increased both the rate of divorce and the rate of replacement of an absent former mate.
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