Evolutionary rotation of fly genitalia tied to mating success

In the order Diptera, more-primitive species such as mosquitos generally do their deed in the end-to-end position. Higher (more evolved) species such as flies tend toward the male mounting the female from behind (male-above ...

Migrants face a trade-off between status and fertility

Researchers from the Universities of Helsinki, Turku and Missouri as well as the Family Federation of Finland present the first results of a new, extraordinarily comprehensive population-wide dataset that details the lives ...

Distinguishing males from females among king penguins

It is difficult to distinguish males from females among King Penguins, but a new Ibis study reveals that King Penguins can be sexed with an accuracy of 100% based on the sex-specific syllable pattern of their vocalisations. ...

A sex difference in sports interest: What does evolution say?

Sports are enormously popular, and one striking pattern is that boys and men are typically much more involved than are girls and women. This sex difference has policy implications, and it raises fundamental questions about ...

Adapting to -70C in Siberia: A tale of Yakutian horses

From an evolutionary perspective it happened almost overnight. In less than 800 years Yakutian horses adapted to the extremely cold temperatures found in the environments of eastern Siberia. The adaptive process involved ...

When leaving your wealth to your sister's children makes sense

In most human societies, men pass on their worldly goods to their wife's children. But in about ten percent of societies, men transfer their wealth to their sister's sons, a process called matrilineal inheritance. A new study ...

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