The false extinction of ichthyosaurs
When did they really die out, the ichthyosaurs, these marine reptiles which populated the seas several million years ago? Up until very recently the specialists situated their decline at the end of the Jurassic. Valentine Fischer, a researcher at the University of Liège, has just demonstrated that their decline only took place at the beginning of the Upper Cretaceous, in other words around 50 million years later. But the causes of this extinction still remain very mysterious...