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ScienceDaily
Jun 24, 2016, 3:50 pm98 ptsTrendingSparrows form pair bonds that are normally monogamous, but many females are unfaithful to their partner and have offspring with other males. Biologists believe that the male birds are unfaithful to ensure they father as many chicks as they can, while females are unfaithful with males of better 'genetic quality'…
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