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Message: <blockquote data-quote="nickderry" data-source="post: 1699438" data-attributes="member: 12328">I'm thinking, I hadn't thought about it before. The issue isn't as simple as a regular changing of the guard, and the male has to sing when he can. What of the male birds that are singing throughout the day - non breeders that are tolerated on a sitting bird's territory, ones leaving the eggs for a brief spell???I'm sorry if it seems that people are dismissing your observations, I think you've opened up a fascinating debate and thank you for it, but the answer you give isn't 100% the explanation either. Males sitting on the eggs during the day may be a symptom and not the cause.</blockquote>