Explore the Evolutionary Timeline

Trace the origin of life back in time to the Earth's creation.

Origin of Species

Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Evolution Timeline
Over time, life in the sea became more varied and complex. Four hundred and twenty-five million years ago, vibrant reef systems existed. Shelled animals, such as trilobites, brachiopods, and cephalopods, were everywhere. The first fish evolved during this time. (Courtesy Denver Museum of Nature & Science)
Slideshows
ABC News on Facebook