A sculpture depicting the head of the dinosaur Hylaeosaurus armatus (meaning 'forest lizard'). The head of the larger Hylaeosaurus – shown in full elsewhere in the park – is a fibreglass replica; the head on the ground is the original, which sits on a hill overlooking the Lower Lake. The Crystal Palace lake statues collectively show several species of extinct mammals, amphibians, therapsids, marine reptiles, pterosaurs and dinosaurs. They represent the first attempt to accurately reconstruct the three dinosaur species known to the scientific world by the 1850s within their geological environment and the sculptures and associated geological strata form a unique display of the state of palaeological understanding in the 1850s, opened five years before the publication of Darwin's 'Origin of Species'.