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In the case of the white-throated sparrows, Formica and Tuttle report that 35 percent of the nests they sampled in 2000 had at least one chick that was the result of the female copulating with a male other than her mate. … Behavioral Ecology 14:425-432. doi: 10.1093/beheco/14.3.425 The sparrows were in this thicket. White-throated sparrow, Zonotrichia albicollis, white form, taken by Ken Thomas (public domain). This one is the tan form. The figure above is from Tuttle 2003.