The unexpected discovery of a new type of genetic variation suggests that natural selection -- the force that drives evolution -- is both more powerful and more complex than scientists have thought.

A strange tiny species of crustacean has challenged the way we think about natural selection and evolution. This microscopic animal, known as a water flea or Daphnia pulex, generates genetic variation ...

Speciation, adaptive radiation, and evolution -- Daphne finches : a question of size -- Heritable variation -- Natural selection and evolution -- Breeding ecology and fitness -- A potential competitor ...