The Dunnock is a very promiscuous bird however the male wants to guarantee his parentage of any offspring resulting from the union of any female. The male, positioned behind the female, will then hop from side to side before pecking at the female's cloaca and this may continue for several minutes. The cloaca may become pink and swollen. As it swells, it makes strong pumping movements and this results in the ejection of sperm from any previous mating attempts. In this way, a male can increase his chances of fathering any young. This video was taken through a window looking into my garden and of course they decided to do this under a table!
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Full copulation took place behind a flower pot but I am pleased I have been able to video this pre -copulation part.
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