Fossils of the now extinct Opabinia were long seen as evidence of the so-called Cambrian explosion. Photo: SCMP Pictures
Fossils of the now extinct Opabinia were long seen as evidence of the so-called Cambrian explosion. Photo: SCMP Pictures

Did animal dung cause the Cambrian explosion? Chinese researchers think so

Fossils of the now extinct Opabinia were long seen as evidence of the so-called Cambrian explosion. Photo: SCMP Pictures
Fossils of the now extinct Opabinia were long seen as evidence of the so-called Cambrian explosion. Photo: SCMP Pictures
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