The Spinosaurus was a real Cretaceous predator from North Africa, recognised by the tall sail on its back and long crocodile-like snout. It became widely known after Jurassic Park III in 2001, where it was presented as a rival larger than Tyrannosaurus rex. Because no one knows how dinosaurs actually sounded, film and game roars are invented from layered modern animal calls. Clips like this one circulate in dinosaur edits, games and meme videos whenever creators need an instantly recognisable prehistoric predator sound.