Butterflies exhibit striking differences between males and females, a phenomenon called sexual dimorphism. These variations, ...

A lower percentage of males improves mating behaviour and feather cover, with similar reproduction results and higher ...

Researchers who analyzed data from zoo animals found that it is not only genetics, but mating pressures that may determine ...

Among mammals, females generally live longer. The recent comparative study examined 528 mammal species in zoos and found that ...

Scientists in Thailand have identified a new burrowing spider species, Damarchus inazuma, featuring a rare bilateral ...

In arid parts of central Australia, temperature plays a big part in determining whether central bearded dragon embryos emerge ...

Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study.

A new type of spider, male on one side of its body and female on the other, has been unearthed in a Thai forest and named ...

Across 1,000 species, males die younger than females—even in zoos. A global study shows biology, not just lifestyle, drives ...

Michigan State University scientists have pinpointed the molecular "switch" that supercharges sperm for their final sprint to ...

Women usually live longer than men, and animals show the same pattern. Evolution, genes, and parenting explain why.

Across mammal species, from baboons and gorillas up to humans, females usually live longer than the males do. However, this ...