Herbivore dinosaurs...

[Spalea]

Alamosaurus: very big dinosaur sauropod titanosauridae of the Late Cretaceous (69-66 millions years ago) of the what is now the United States, one of the bigest known from North America. 28-30 meters long, around 70 tons when fully adult (see wikipedia). From other sources (https://www.newdinosaurs.com/alamosaurus/ ), it weighed only 33 tons.

Alamosaurus was a contemporary of the tyrannosaurus. But, adult, IMO, it shouldn't have feared it. Especially since it seems to have been very powerfully built. Nevertheless it's quite possible that tyrannosaurids could regularly hunt some juveniles, especially if they hunted in pride.

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*This image is copyright of its original author

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