Safari Ltd Horseshoe Crab XLSafari Ltd Horseshoe Crab This is part of the Safari Ltd Incredible Creatures collection. These are larger sized animal figures showcasing scaled model figures of reptiles, fish, invertebrates, mammals, and more. Did you know that because the origin of horseshoe crabs dates back to the Ordovician period (about 450 million years ago), they are considered living fossils? Horseshoe crabs can be found in shallow ocean waters and occasionally on the shore.