It is assumed that many bird species are monogamous, yet infidelity is a widespread phenomenon. The advantage for the male seems obvious as in this way he can increase the number of his offspring. A female, however, mostly faces costs. The cuckolded partners often reduce their parental care. In addition, the extra lovers also may transmit diseases. Nevertheless, some females actively seek such contacts. Researchers investigated a large number of zebra finches and found a possible explanation for this behaviour. In a genetic long-term study they found that females inherit the disposition for their infidelity from their fathers.
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