2026-05-07
Ankylosaurus — the tank that outlasted T. rex
Ankylosaurus lived 68-66 million years ago in western North America. Here's what the fossils tell us about this armored dinosaur.
When and where
Ankylosaurus lived during the very last stretch of the Cretaceous, roughly 68 to 66 million years ago. Its fossils come from Montana, Wyoming, and Alberta — the western interior of North America. At that time, a warm inland sea divided the continent, and Ankylosaurus roamed the coastal lowlands on the western side. It was one of the last non-avian dinosaurs on Earth.
How we know
Paleontologist Barnum Brown named Ankylosaurus in 1908, based on a partial skeleton unearthed in the Hell Creek Formation of Montana. The name means "fused lizard," a reference to its armored bones. To date, only a handful of specimens have been found, and no complete skeleton exists. The best material includes parts of the skull, vertebrae, ribs, shoulder blades, and the famous tail club. Every new find adds detail, but the full body plan still comes from reconstruction. Source: Wikipedia.
What set it apart
Ankylosaurus reached about 6 to 8 metres long and weighed an estimated 4.8 tonnes. Its body was covered in hard, bony plates called osteoderms, and its skull was covered in fused armor as well. The tail ended in a heavy club that could deliver serious blows to a predator. Unlike its relatives, which are known from more complete skeletons, Ankylosaurus is the best-known member of its family despite its patchy fossil record. That says more about its distinctive appearance than the quality of its remains.
For collectors and classrooms
A hand-painted Ankylosaurus figurine works well for teaching anatomy. The tail club, the armored back, and the low, wide stance are all distinctive features. It is a solid choice for a classroom display or a collector's shelf.