Trilobites rolled themselves up much like modern pill bugs do to defend themselves from predators, according to a study of a recently discovered fossil. The new fossil dates back about 513 million years, the oldest evidence of this type of behavior in the extinct creatures. "Until now, it was thought that this group was incapable of enrolling, as they lack various of the complex adaptations observed in younger trilobites," said University of Cambridge paleobiologist Javier Ortega-Hernandez, who co-authored the study published in Biology Letters.

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