Allosaurus and Stegosaurus were contemporaries in the Late Jurassic Morrison Formation, forming a classic predator-prey pair.
Allosaurus (9.7 m, carnivore) weighed ~2,300 kg; Stegosaurus (9 m, herbivore) weighed ~5,000 kg.
Stegosaurus defended itself with a spiked tail (thagomizer); evidence of Allosaurus bite marks on Stegosaurus bones confirms they interacted.
Allosaurus was bipedal and fast; Stegosaurus was slow and quadrupedal with a tiny walnut-sized brain.
Stegosaurus's back plates may have aided in thermoregulation or display, not direct defense against Allosaurus.
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Did You Know? fun facts
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Did You Know?
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Stegosaurus weighed roughly 2x more than Allosaurus.
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Allosaurus was a carnivore while Stegosaurus was a herbivore.
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Both dinosaurs lived during the Jurassic Late period and may have coexisted.
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Allosaurus belonged to Theropoda while Stegosaurus belonged to Stegosauria.
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