Who Were The Biggest Dinosaurs?

The biggest dinosaurs were the sauropods. Sauropods were herbivorous quadrupeds with long necks and tails, and small heads. They are thought to have first appeared in the Late Triassic Period, and to have become extinct in the Cretaceous–Paleogene extinction event 66 million years ago. The largest sauropod was Patagotitan mayorum, which was discovered in Argentina in 2014. It measured 37 metres (121 ft) in length, 20 metres (66 ft) in height, and weighed 69 tonnes (76 short tons). The second largest sauropod was Argentinosaurus huinculensis, which was discovered in Argentina in 1987. It measured 34 metres (112 ft) in length, 20 metres (66 ft) in height, and weighed 58 tonnes (64 short tons). The third largest sauropod was Ultrasauros macintoshi, which was discovered in the United States in 1998. It measured 30 metres (98 ft) in length, 20 metres (66 ft) in height, and weighed 50 tonnes (55 short tons). The fourth largest sauropod was Supersaurus vivianae, which was discovered in the United States in 1972. It measured 29.5 metres (97 ft) in length, 17 metres (56 ft) in height, and weighed 33 tonnes (36 short tons). The fifth largest sauropod was Bruhathkayosaurus matleyi, which was discovered in India in 1989. It measured 28 metres (92 ft) in length, 16 metres (52 ft) in height, and weighed 30 tonnes (33 short tons).