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Laying a big egg on a little ledge:
does it help a female Common Guillemot if Dad's there?

Harris, M.P. & Wanless, S. (2006) British Birds 99: 230-235
Female Common Guillemots (Uria aalge) face the challenge of laying a large egg on a cliff ledge, often surrounded by tetchy neighbours. We documented the laying of 754 eggs, during 82% of which the male was present. The presence of the male had no effect on either the short-term survival of the egg or the chances of a chick successfully leaving the colony. Male attendance at laying may be largely fortuitous, resulting from the long periods that he is present for other purposes.

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