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Some trilobites could enroll into a defensive ball for protection.

AMNH
#TrilobiteTuesday Fact: Some trilobites could enroll into a defensive ball for protection. http://trib.al/LHtOECE http://t.co/e26L42w4aY
6:22 AM Feb 03 2015

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Even though they were covered in armor, they could still roll in a ball... millions of years before armadilloes evolved a similar strategy!

Hedgehogs and porcupines do this too. Rolling in a ball is a good defense strategy. 

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