rex.ĭinosaurs had a remarkable run on Earth. The study estimated Giganotosaurus at about 6 tons, pretty darned big, but just a bit shy of dethroning T. rex edged out another super predator that some scientists had once figured was bigger based on the length of its skull, Giganotosaurus, which lived alongside Argentinosaurus in ancient South America. The largest meat-eating dinosaur was Tyrannosaurus rex, which weighed 7 tons and is also the largest known land predator of all time.
“That seems amazing to me,” added Benson, whose study was published in the scientific journal PLOS Biology.
A sparrow-sized bird called Qiliania that lived about 120 million years ago in China earned the distinction of being the smallest dinosaur, weighing a mere 15g.īenson noted that Argentinosaurus was about 6 million times the weight of Qiliania, and that both still fit within the dinosaur family. In their dinosaur ‘weigh-in’, the scientists included birds, which arose roughly 150 million years ago within a group of feathered dinosaurs called maniraptorans.
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