Hundreds of perforated Cambrian shells reveal distinctive predator-prey dynamics in the ocean 517 million years ago. Researchers from the American Museum of Natural History have uncovered the earliest known evidence of an evolutionary arms race in the fossil record. The 517-million-year-old predator-prey interactions took place in an ancient ocean that once covered present-day South Australia. [...] 517 Million Years Ago: Scientists Uncover Oldest-Known Evolutionary “Arms Race”
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2 Hundreds of perforated Cambrian shells reveal distinctive predator-prey dynamics in the ocean 517 million years ago. Researchers from the American Museum of Natural History have uncovered the earliest known evidence of an evolutionary arms race in the fossil record. The 517-million-year-old predator-prey interactions took place in an ancient ocean that once covered present-day South Australia. [...] 
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