Meadow of dancing brittle stars shows evolution at work
(PHYSorg.com Archaeology & Fossils)

Researchers have described a new species of brittle star, which are closely related to starfish, and showed how these sea creatures evolved in response to the rise of shell-crushing predators during the late Palaeozoic Era. The results, reported in the Journal of Systematic Palaeontology, also suggest that brittle stars evolved new traits before the largest mass extinction event in Earth`s history, and not after, as was the case with many other forms of life.