{"id":17,"count":13,"description":"Trilobites are prehistoric bottom dwelling sea creatures related to the modern day horse-shoe crab. Since they had a hard exoskeleton body\u00a0which was conspicuously segmented, they rolled up for defense just as a modern\u00a0roly- poly.\r\n\r\nThese small animals are a diverse group of extinct arthropods, they were one of the first living creatures to develop compound eyes. Scientists have identified about 20,000 species of trilobites world wide.\r\n\r\nThey first appeared in the Cambrian period around 540 million years ago. 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