The National Museum of Natural History opens the doors to the world of prehistory and offers visitors the opportunity to take a unique and spectacular journey into the environments that populated the Earth over 250 million years ago. The exhibition Loong Diving in the Ocean - The Ancient Ocean in Triassic Guizhou focuses on ichthyosaurs, or fish lizards, fascinating marine reptiles that lived at the time of the dinosaurs and became extinct about 90 million years ago. They were animals perfectly adapted to aquatic life, and their resemblance to modern dolphins or fish is an extraordinary example of evolutionary convergence of unrelated animals. Over 50 marine reptile fossils on display, borrowed from the Guizhou Geological Museum. Among the finds, there is an 8-meter-long complete ichthyosaur skull and a fossil of a pregnant ichthyosaur, both found and excavated in Guizhou Province. Ichthyosaurs appeared 252 million years ago, after what was known as the largest mass extinction in recorded history, which killed about 81 percent of marine species. Starting from terrestrial ancestors, this group of marine reptiles quickly adapted to aquatic life and dominated the sea for more than 100 million years.