Tyrannosaurus Rex 42 feet 18 feet 5-7 tons 25 mph Teeth Though the Tyrannosaurus had many different sizes of teeth, all were razor sharp and some grew to lengths of 9-13 inches. Broken teeth were replaced frequently by newer teeth. The powerful jaw exerted in excess of 3000 pounds of pressure! Osborn 1905 Canada Alberta &tyrannosaurus; Stegosaurus Armatus 25-40 feet 14 feet 2-4 tons &speed-not-known; Spikes The Stegosaurus had two long rows of armor along its back. At the end of its tail four large spikes were an excellent defense. Marsh 1877 United States Colorado &stegosaurus; Gallimimus Bullatus 18 feet 8 feet 1000 pounds 35-60 mph Osmólska Roniewicz Barsbold 1972 Mongolia Nemegtskaya Svita &gallimimus; Triceratops_Horridus 30 feet 14 feet 10 tons &speed-not-known; Horns The Triceratops had two large horns and a third beak horn. These horns could be used for defensive purposes or to establish dominance in a group. Marsh 1889 United States Colorado The Triceratops had three large horns and a huge bony frill. It's snout was shaped like a beak and it's two large horns were hollow. Archaeopteryx Lithographica 3 feet 2 feet Weight not known &speed-not-known; Feathers The Archaeopteryx had feathers that could have been used to help it fly. Additionally, its sharp claws and teeth could help it devour prey. Von Meyer Sir Richard Owen 1863 Bavaria Solnhofen Limestone, Pappenheim The Archaeopteryx is very controversial. It is said to be the missing link between Dinosaurs and modern birds.