This is not a geode. It's an animal. An apparently delicious animals with clear blood, whose body is accumulates surprisingly large amounts of a rare metal used to strengthen steel. This is Pyura ...

“Period Rock? You’re calling me Period Rock now? Guys, seriously, I might look like a stone, but that doesn’t mean I have the heart of one. Why doesn’t anyone ever just call me Michael?” Despite ...

The sea holds some of the world’s most interesting creatures – but this “living rock” is one of the strangest we’ve ever seen. Pyura chilensis is a non-moving sea creature that lives along the coasts ...

I’m eating a turkey and swiss sandwich right now, and I’m watching this video. Please don’t do as I do. Learn from my mistakes. This sea creature, the Pyura chilensis, lives off the coasts of Chile ...

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Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment. Rachael has a degree in Zoology from the ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American “Period Rock? You’re calling me Period Rock ...