pill bug
- n small terrestrial isopod with a convex segmented body that can roll up into a ball
pill bug :
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- How Cute! Trilobites Curled Up in Self-Defense
About 513 million years ago, a creature curled up like a pill bug to protect itself from predators, a recently-discovered fossil suggests.
Sept. 24, 2013 - LiveScience.com via Yahoo! News