Fossils of Spriggina floundersi provide the earliest evidence of animals favouring one side of the body over the other – a ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Cambrian creatures in a colorful explosion A cursory flip through any high school biology textbook will ...

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How ancient bryozoans may have looked. (Zhifei Zhang) The Cambrian explosion was one of the most dramatic chapters in the history of evolution. Around 540 million years ago, a sudden, astonishing ...

A research team at Yunnan University has resolved a longstanding mystery regarding Earth’s earliest vertebrates, revealing ...

Researchers studying ancient rocks from the late Ediacaran period uncovered a fossil evidence that complex animal groups, including the closest known invertebrate relatives of humans, may have existed ...

Biomechanical studies on the arachnid-like front "legs" of an extinct apex predator show that the 2-foot (60 centimeter) marine animal Anomalocaris canadensis was likely much weaker than once assumed.

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 ...

Five hundred million years ago, tacos existed. But they weren’t corn or flour; they were the hard-shelled coverings on a now-extinct sea creature, Odaraia alata. According to new research, the ...

A newly described species from the Burgess Shale had three eyes, clawed limbs, and a tail full of gills—plus internal organs preserved in stunning detail. Reading time 3 minutes A newly described ...

Around 500 million years ago a strange creature with bulging eyes, a rudderlike tail and 30 pairs of spiny limbs extending from its cigar-sized body swam through Earth’s seas. Most of its legs ...