Polygamous birds are having more advantages over monogamous birds.
<h3><u>Explanation:</u></h3>
Polygamy is the phenomenon where the birds undergo more than one sex with more than one sex partners. Whereas monogamy is the phenomenon where the partners are fixed, and they undergo sex with only one partner for their whole lifetime.
Polygamous birds have more variation because of the more homogenous gene mixing and they have the progenies that are more suitable for adaptation to environmental changes. These progenies will evolve faster owing to more gene variation.
Whereas the monogamous birds will have the gene variation among themselves which will be restricted to the gene pool comprising the gene pools of both the parents.
So the birds with polygamy will survive better than monogamous ones.