Early animals formed complex ecological communities more than 550 million years ago, setting the evolutionary stage for the Cambrian explosion, according to a new study. Early animals formed complex ...

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For most of the nearly 3.5 billion years of documented life on Earth, creatures were simple, dominated by organisms such as bacteria, algae and fungi (SN: 10/13/18, p. 10). Then, beginning about 541 ...

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Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian ...

A creature with a massive head shield, sand-raking claws and a circular tooth-filled mouth swept across the ocean bottom half-a-billion years ago, hoovering up prey like a living Roomba. Measuring ...

Components of the newly-described Fezouata fauna. a, Demosponge Pirania auraeum b, Choiid demosponge c, Annelid worm d, Organism showing possible similarities to halkieriids e, Possible armoured ...