Ankylosaurus[nb 1] is a genus of armored dinosaur. Its fossils have been found in geological formations dating to the very end of the Cretaceous Period, about 70-66 million years ago, in western North America, making it among the last of the non-avian dinosaurs. It was named by Barnum Brown in 1908; it is monotypic, containing only A. magniventris. The generic name means "fused" or "bent.. Thagomizer on a mounted Stegosaurus tail A thagomizer (/ ˈθæɡəmaɪzər /) is the distinctive arrangement of spike-shaped osteoderms on the tails of some stegosaurian dinosaurs. These spikes are believed to have been a defensive measure against predators. The arrangement of spikes originally had no distinct name. Cartoonist Gary Larson invented the name "thagomizer" in 1982 as a joke in.
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Dinosaurs With Spikes on Back Like modern-day lizards like thorny devils, several dinosaur species had spikes on their backs. Most of these were slow, lumbering behemoths with armor covered with spikes, including stegosaurs, ankylosaurs, and nodosaurs.. Ankylosaurus was a dinosaur with short, squat legs that allowed it to run at about 6 miles per hour - fast, but not fast enough to outrun a large carnivorous predator like Tyrannosaurus rex.
/ankylosaurusWC-58b9abf45f9b58af5c907812.JPG "Facts About Ankylosaurus, the Armored Dinosaur")
