In fact, social monogamy is extremely common in birds and somewhat common in mammals, while sexual monogamy is vanishingly ...

Superb starlings help care for the offspring of birds they are not related to. “To me, that sounds like friendship,” one ...

The development of DNA identification has given scientists potent new tools for discovering the genetic relationships between animal parents and their offspring ... birds' nests contain another ...

The path from the initial discovery of sex chromosomes in 1891 to an understanding of their ... the male beetles. Based on her comparisons of chromosome appearance in cells from male and female ...

Female birds are more vulnerable than males ... where extra-pair young have been shown to be more likely to be male, the mitonuclear incompatibility hypothesis was retrospectively tested.