The majority of fossils from the dinosaur era are likely still buried underground, waiting to be found. Fossils are the only physical evidence of dinosaurs that have survived to the present day, and they are crucial for scientists to learn about these ancient creatures. Sometimes, it can take many years to determine what species a newly discovered fossil belongs to, as was the case with some unusual remains found in Canada. These fossils were so strange that it took paleontologists a long time to figure out exactly what kind of marine reptile they belonged to. Fossils form when the remains of plants or animals are buried under layers of sediment, which over time turn into rock. This process can take thousands or even millions of years, preserving the shape and structure of the original organism. In some cases, the fossilization process can leave behind detailed impressions of bones, skin, or even internal organs, giving scientists a rare glimpse into the biology of extinct species. Éric Buffetaut, a paleontologist, was recently interviewed by Futura-Sciences to discuss the formation of fossils and the challenges of identifying new species. He explained that the process of discovery and classification is often slow and complex, especially when dealing with incomplete or unusual remains. Paleontologists use a combination of fieldwork, laboratory analysis, and comparisons with known species to determine the identity of a fossil. Despite the difficulties, each new discovery adds to our understanding of prehistoric life. Fossils not only help scientists piece together the evolutionary history of animals but also provide clues about the environments in which they lived. As more fossils are uncovered and studied, the picture of Earth's ancient past continues to become clearer.