Aerosteon riocoloradensis este un dinosaur pradator care a trait in perioada cretacica, in urma cu aproximativ 85 milioane de ani, fiind inrudit cu specia Allosaurus, inlocuita ulterior de Tyrannosaurus Rex. Oasele pradatorului care masura 10 metri in lungime si cantarea mai mult decat un elefant adult, au fost descoperite pe marginea raului Colorado din Argentina. Ramasitele fosile prezentau mici gauri de aer in oase, fapt care arata ca acestia aveau plamanii similari pasarilor moderne.
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