Iguanodon (10 m, ~3,400 kg) lived in the Early Cretaceous of Europe; Edmontosaurus (12 m, ~4,000 kg) lived in the Late Cretaceous of North America โ separated by ~65 million years.
Both were large ornithopod herbivores that could walk on two or four legs.
Iguanodon had a distinctive thumb spike used for defense or foraging; Edmontosaurus had a soft-tissue crest but no spike.
Iguanodon was one of the first dinosaurs ever named (1825); Edmontosaurus was named nearly a century later (1917).
Iguanodon's thumb spike was initially mistaken for a nose horn by early paleontologists.
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Did You Know? fun facts
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Did You Know?
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Both Edmontosaurus and Iguanodon were herbivores.
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Edmontosaurus lived during the Cretaceous Late while Iguanodon lived during the Cretaceous Early, separated by roughly 79 million years.
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Iguanodon was discovered 92 years earlier, in 1825.
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Edmontosaurus belonged to Hadrosauridae while Iguanodon belonged to Ornithischia.
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