Indeed, even at around 100 feet long, Supersaurus has been estimated to weigh in between 35 and 40 tons. The biggest dinosaurs started off very, very small. Sauropod mothers laid clutches It measures 5.5 feet (1.6 meters) and is preserved with multiple layers of feathers along its arms and torso. This large dinosaur, believed to weigh over 40 pounds (20 kilograms), could not fly Velociraptor (/ v ə ˌ l ɒ s ɪ ˈ r æ p t ər, v ə ˈ l ɒ s ɪ r æ p t ər /; lit. 'swift thief') is a genus of small dromaeosaurid dinosaurs that lived in Asia during the Late Cretaceous epoch, about 75 million to 71 million years ago.Two species are currently recognized, although others have been assigned in the past. The type species is V. mongoliensis, named and described in 1924. Stegosaurus was a large, plant-eating dinosaur that lived during the late Jurassic Period, about 150.8 million to 155.7 million years ago, primarily in western North America. It was about the size Blue whales are the largest animals ever known to have lived on Earth. These magnificent marine mammals rule the oceans at up to 100 feet long and upwards of 200 tons. Their tongues alone can Dreadnoughtus Dreadnoughtus Dreadnoughtus, the largest dinosaur whose size can be calculated reliably. A very complete fossil of this sauropod was unearthed in 2009. In life Dreadnoughtus was 26 metres (85 feet) long and weighed about 65 tons. Encyclopædia Britannica, Inc. T. rex had strong thighs and a powerful tail, which counterbalanced its large head (Sue's skull is 5 feet, or 1.5 m, long) and allowed it to move quickly. The 2011 study, which also modeled T. rex Late Cretaceous, 90 million years ago. Found in: Argentina. The exact size of Argentinosaurus is hard to estimate due to the incompleteness of its fossilised remains. But it is one of the largest land animals ever found. It carried on growing throughout most of its lifetime. Other similarly massive dinosaurs include Patagotitan and Puertasaurus. This would not, incidentally, have been the only known dinosaur vs. crocodile cage match. (If it did in fact prey on dinosaurs on a regular basis, that would go a long way toward explaining the exceptionally large size of Deinosuchus, as well as the enormous force of its bite: about 10,000 to 15,000 pounds per square inch, well within For a long time, it was the largest known dinosaur, until other larger species fossils were discovered and identified. D. longus , the type species, was about 80-85 feet long and weighed 10-11 tons or 20,000 to 22,000 lbs. or more, although reports vary or get confused with the two other species. Qa59p08.