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Ankylosaurus was covered with massive armor to protect it from predators, was up to 33 feet (10 meters) long, and weighed over 4 tons.
The armor consisted of hundreds of oval-shapped bony plates embedded in its leathery hide. There were also four spikes on its head (two at the back, and one on each cheek), and a heavy bony growth on the end of its tail, which was was probably use a club in defense, when Ankylosaurus was attacked by predators.
Ankylosaurus was named by Barnum Brown in 1908 and means "stiffened lizard".
Ankylosaurus was a herbivore (plant-eater) that lived from 74 to 65 million years ago
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