On a remote island in North Macedonia, male Hermann’s tortoises outnumber females 19 to 1, an imbalance driving the ...

Nature does not reward politeness, and being a male or female doesn't change that rule either. Across the animal kingdom, the ...

Human men are typically more aggressive than human women, a finding supported by reams of research. But surveys of 4,136 individuals in 24 countries reveal an exception to the trend: aggression in ...

Researchers at the Francis Crick Institute have found that hunger can make virgin female mice aggressive towards pups, but only in certain hormonal states. These mice would usually ignore other ...

Although the study only finds a correlation, rather than causation, between violent crimes perpetrated by young British women and an increase in binge drinking among the same demographic, the results ...

This excerpt is from the newly revised and updated Odd Girl Out: The Hidden Culture of Aggression in Girls published earlier this month. Republished with permission. Rachel Simmons is the co-founder ...