When female birds mate with males other than their social partners and have broods of mixed paternity, the offspring sired by these "extra-pair" fathers may often get a head start in life, according ...

Bird parents typically raise their young in seemingly peaceful cooperation and were therefore seen as reflecting the ideal of monogamous partnership. This view has changed dramatically over the last ...

In many social animals, females mate with multiple males, but the adaptive value of female extra-pair mating is not fully understood. Here, we tested whether male pied flycatchers (Ficedula hypoleuca) ...

While considerable variations in both the frequency of extra-pair paternity (EPP) and the behavioral events that produce it are recognized among species, populations, individuals, and breeding ...