models were built, only skulls of the Cretaceous fossil Mosasaurus had been discovered in the Netherlands, so Hawkins only built the head and back of the animal. He submerged the model deep in the lake, leaving the body unseen and undefined. The Mosasaurus at Crystal Palace is positioned in an odd place near the secondary island that was originally a waterfall, and much of it is not visible from the lakeside path. The three Plesiosaurus models represents three species of marine reptile, P. macrocephalus, P. dolichoderius and P. hawkinsii, from the Jurassic of England. Two of them have implausibly-flexible necks. Owen noted that the Pterodactylus fossils from the Jurassic of Germany had scales, not feathers, and while "somewhat bird-like" they had conical teeth, suggesting they were predatory. The two surviving models are perched on a rock outcrop; there were originally two more 'pterodactyls of the Oolite'. Owen correctly identified Teleosaurus as similar to gharials, being slender Jurassic Crocodilians with very long thin jaws and small eyes, inferring from the sediment in which they were found that they were "more strictly marine than the crocodile of the Ganges [the gharial]." Cenozoic era Anoplotherium is an extinct mammal from the Eocene to Oligocene epochs, first found near Paris. Hawkins's models draws on Owen's speculation about its camel-like appearance. Three models were made, forming a small herd. Megaloceros giganteus or Irish Elk is a species from the Pliocene to Pleistocene epochs in Eurasia. Hawkins built a family unit of male, female and fawn; the adult male bore antlers made from actual fossil antlers, long since replaced. Moved from the third island, they had fallen into disrepair as they were in a place easily accessible by vandals. With their original but fragile antlers, the Irish Elks were the most accurate of the cenozoic models; since they are of recent geological age (dying out 11,000 years ago), Hawkins was able to model them on living deer. The giant ground sloth Megatherium is from the Pliocene to Pleistocene epochs in South America, where Charles Darwin had excavated some fossils in 1835. The model was built hugging a live tree which subsequently grew and broke the model's arm. The arm was replaced and later the tree died. The model depicts the sloth as having a short trunk like a tapir, something the real animal never had. This model used to be in the children's zoo which has