Question

what ara largest dinosaurs

Answer 1

Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive titanosaur Argentinosaurus huinculensis, which is the largest dinosaur known from uncontroversial evidence, estimated to have been over 50 t (55 short tons) and 39.7 m (130 ft) long.

Answer 2

The sauropods were the largest and heaviest dinosaurs. For much of the dinosaur era, the smallest sauropods were larger than anything else in their habitat, and the largest were an order of magnitude more massive than anything else that has since walked the Earth.
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