Ankylosaurus (10 m, ~6,000 kg) and Stegosaurus (9 m, ~5,000 kg) were similar in size but very different in armor design.
Ankylosaurus had a massive tail club capable of shattering bone; Stegosaurus had a spiked tail (thagomizer) for slashing.
Ankylosaurus was covered in osteoderms (bone embedded in skin); Stegosaurus had large upright plates along its back.
Stegosaurus lived in the Late Jurassic; Ankylosaurus lived in the Late Cretaceous โ separated by ~80 million years.
Both were quadrupedal herbivores relying on passive and active defense rather than flight from predators.
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Did You Know? fun facts
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Did You Know?
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Both Ankylosaurus and Stegosaurus were herbivores.
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Ankylosaurus lived during the Cretaceous Late while Stegosaurus lived during the Jurassic Late, separated by roughly 96 million years.
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Stegosaurus was discovered 31 years earlier, in 1877.
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Ankylosaurus belonged to Ankylosauria while Stegosaurus belonged to Stegosauria.
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