Nick Davies, a British ecologist observed a pair of Dunnocks. They had been feeding together, hopping gently towards a bush. The male proceeded to one side, the female to the other. Once out of the male’s field of vision, the female instantly flew into the nearby undergrowth, where she mated with a different male Dunnock who had been hidden there. Then she rejoined her mate, acting as though nothing had happened.
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http://www.island.lk/2009/06/18/features8.html