Therizinosaurus and others of its family tree are descend from carnivores despite being herbivores, what other prehistoric creatures have evolved to change their diet?
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A better example is in Ankylosauria. Liaoningosaurus was a very small semi-aquatic Ankylosaur that might have become a piscivore!
Ceratosaurs, we know that Noasaurids have had to change there diets to herbivorous. In fact Deltadromeus might have actually been an elphrosaurid based off current phylogenetic analysis. Making Deltadromeus a herbivore instead of a carnivore.