Trilobite Plush 12" Stuffed Animal Collectible Fossil ToyThis incredible digital print plush trilobite is a perfect collectible for the prehistoric fossil enthusiast! This plush animal includes an educational hang tag teaching kids about trilobites. Trilobites, exclusively marine animals, first appeared at the start of the Cambrian Period (about 542 million years ago). They dominated the oceans for almost 270 million years and were the most successful of all early animals with over 20,000 described species!