Why are some groups of animals so diverse?

A new study of finger-sized Australian lizards sheds light on one of the most striking yet largely unexplained patterns in nature: why is it that some groups of animals have evolved into hundreds, even thousands of species, while other groups include only a few?

If you want to include this story in your blog, copy and paste this formatted text:

<p><a href="http://www.physorg.com/news109424369.html">Why are some groups of animals so diverse?</a></p> <p>A new study of finger-sized Australian lizards sheds light on one of the most striking yet largely unexplained patterns in nature: why is it that some groups of animals have evolved into hundreds, even thousands of species, while other groups include only a few? </p>