Just last night, scientists have composed a new theory that our classification on Dinosaur Family groups might have been wrong the whole time!
For a long time, Dinosaurs have been classified into two main groups, the Saurischian order, and the Ornithischian order. Originally, Theropod Dinosaurs like T. Rex, Velociraptor, Spinosaurus, Gallimimus, Dilophosaurus, Allosaurus, Therizinosaurus ext. were classified in the Saurischian order along side the long-necked Sauropod Dinosaurs like Brachiosaurus, Apatosaurus, Diplodocus ext.
However, according to the article, the new theory suggests that Theropod Dinosaurs might have actually been more related to the Ornithischian Dinosaurs like Tric