Several large predatory dinosaurs weighing more than one tonne are known from the Late cretaceous of North Africa, this made paleontologists wonder how so many of them would have lived together. "Sigilmassasaurus" existed in the same time and place as other huge meat-eating dinosaurs like "Spinosaurus, Carcharodontosaurus, Deltadromeus," and "Bahariasaurus." The situation is a lot like in the Late Jurassic Morrison Formation of North America, where there were up to five meat-eating dinosaurs weighing more than a tonne, as well as many smaller ones. The difference between their sizes and what they ate could explain why they could live so close to each other, scientists compared this to how predatory animals live alongside each-other in the African savanna.