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Updated February 11, 2017 | Infoplease Staff

Ankylosaurus
Meaning of Name: | ?bent; crooked lizard? |
Period: | Cretaceous Period (138 million to 65 million years ago) |
Size: | 4 - 9 meters long |
Location: | Texas, Antarctica, Utah, and Argentina |
Not only is Ankylosaurus the widest of all dinosaurs, but it's the most heavily armored, with bony plates, studs, and spikes lining its entire back-even its eyelids have spikes. In addition, its tail has a thick knob of bone at the end of it, believed to have been used as a very formidable club against its enemies.
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