Forest birds evolved early, DNA shows

(PhysOrg.com) -- Evolution seems to have happened in fits and starts -- at least that's what the fossil record shows. From trilobites to pterodactyls, ammonites to Archaeopteryx, scientists find the same pattern: brief bursts of innovation in which a single species or branch on the tree of life turns into a cluster of new twigs, then lapses into long stretches ruled by the status quo.

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<p><a href="http://www.physorg.com/news134921975.html">Forest birds evolved early, DNA shows</a></p> <p>(PhysOrg.com) -- Evolution seems to have happened in fits and starts -- at least that's what the fossil record shows. From trilobites to pterodactyls, ammonites to Archaeopteryx, scientists find the same pattern: brief bursts of innovation in which a single species or branch on the tree of life turns into a cluster of new twigs, then lapses into long stretches ruled by the status quo.</p>