Nautiloids Thrived For 500 Million Years Until These Guys Showed Up

Around 30 million years ago, a new group of predators began to push nautiloids from their former global range into a single remaining refuge. But who were these predators?

Thanks to Ceri Thomas for the excellent nautiloid, seal, and whale reconstructions!
https://nixillustration.com

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References: https://docs.google.com/document/d/1W...