Giant Trilobites in Portugal Could Be Biggest: Discovery News

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Artur Sa, University of Tras-os-Montes and Alto Douro |

Trilobite Cluster
A block of slate with a group of trilobites found on the rocks of Arouca in northern Portugal. The cluster shows how the trilobites clustered together in the thousands. Researchers believe they congregated as a protection during molting when their shells were soft an vulnerable to predators. They also appear to have gathered as an efficient way to mate with one another. | Discovery News Video

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