Heterodontosaurus, also known as Heterodontosaurus or Spinosaurus, is a carnivorous animal resembling a mammal that lived during the Permian period. Heterodontosaurus has a close relationship with mammals, but a distant relationship with dinosaurs, lizards, birds, etc. Its fossils are found in North America and Europe. Heterodontosaurus is a carnivorous ancient organism from the Permian period. The general public associates Heterodontosaurus with a dinosaur, but it is not actually a dinosaur. More precisely, they are classified as Panosauriformes. Although it resembles a lizard in appearance, Heterodontosaurus has a closer relationship with mammals and is farther away from true reptiles such as dinosaurs, lizards, birds, etc.