pill bug :
- n small terrestrial isopod with a convex segmented body that can roll up into a ball
News & Articles
- 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