More than 500 million years ago, during what is known as the Cambrian period, the seas and oceans on Earth were filled with a ...

For decades, scientists have wondered what triggered the sudden "explosion" of complex animal life on Earth. This new hypothesis suggests that the answer isn't found in shells or legs, but in the ...

Microscopic squiggles found in 890-million-year-old Canadian reef rocks may represent the oldest animal body fossils, ...

The Cambrian is a geologic period of the Paleozoic Era, spanning approximately 539–485 million years ago, characterized by a major diversification of multicellular life known as the Cambrian explosion ...

Ancient feeding confirmed: Harvard scientists found quantitative evidence that Cambrian luolishaniids used suspension feeding, filtering plankton from seawater. Modern parallels: Predator–prey size ...