New research shows that mole rat sperm has become simple and degenerate, probably due to 'orthogenic' evolution.

The social lives of ants, wasps and bees have long been a puzzle to scientists. How did complex insect societies — colonies ruled by a queen and many workers — come to be?

Genes essential to producing the developmental differences displayed by social insects evolve more rapidly than genes governing other aspects of organismal function, a new study has found.

Using simple robots to simulate genetic evolution over hundreds of generations, Swiss scientists provide quantitative proof of kin selection and shed light on one of the most enduring puzzles in biology: Why do most social animals, including humans, go out of their way to help each other?

In 1964 biologist William Hamilton introduced Inclusive Fitness Theory to predict and explain phenomena ranging from animal behavior to patterns of gene expression.