Fossil armour

The only way for prey to survive was to come up with a way of protecting themselves. And many did this in a most spectacular way - by growing their own armour. Many different kinds of animals came up with this amazing ability - they learned how to grow crystals that could transform into hard shells and protect them from the new predators.

As well as making life more pleasant (and more possible) for many animals that lived in the sea, shells made life a lot more fun for palaeontologists.

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