Among the plant-eating dinosaurs, the hadrosauroids or "duckbills" must rank as one of the all-time great success stories. Appearing no later than the Aptian, they rapidly diversified and spread across the globe. Spared from annihilation at the close of the Mesozoic, they continued to spread and diversify past what would have been the K/Pg boundary, producing a host of weird forms during the Paleogene.
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