This dinosaur was only supposed to exist in North America — so why is it in Spain?

For millions of years, scientists have pieced together the movements of dinosaurs from fossils scattered across the planet. But every so often, a discovery turns up that makes them rethink where an animal could actually have lived, and one such find in Spain has raised a particularly intriguing question. Because this time, the fossils don’t belong to an obscure creature that few people have… Source