The Earth’s Biggest Dinosaurs

Dinosaurs include some of the largest land animals ever to roam the Earth. The Age of Dinosaurs began approximately 245 million years ago. A mass extinction 65 million years ago ended the reign of these creatures. Some dinosaurs were as small as today’s dogs and chickens, while others stood over five stories tall. Scientists believe that large dinosaurs were able be reach their massive sizes due to a huge metabolism.

Argentinosaurus was a sauropod that lived in the late Cretaceous period and one of the largest dinosaurs found to date. Paleontologists found this herbivore in Argentina. Skeletal remains indicate this this gigantic dinosaur stood approximately 70 feet tall, was 120 feet long and weighed in at roughly 220,000 pounds. Paleontologists discovered a vertebra of the Argentinosaurus that was over four feet thick, which was a good indication of its massive size.

Shantungosaurus was a hadrosaur who lived in the late Cretaceous period. These duck-billed dinosaurs were herbivores that were 25 feet high, 51 feet long and weighed approximately 14,000 pounds. Paleontologists discovered the Shantungosaurus in China. While it walked on four legs, scientists believe that this dinosaur possibly was capable or running on two legs.

Brachiosaurus is a commonly known herbivore which a characteristically long neck. Paleontologists discovered a complete skeleton of a Brachiosaurus in Tanzania. These sauropod dinosaurs were popular in the late Jurassic period, stood 50 feet tall, and were 100 feet long. Brachiosaurus weighed approximately 120,000 pounds. The Tanzanian skeleton had neck vertebra that were over three feet long.

Seismosaurus is a large sauropod that lived in the late Jurassic period. This dinosaur is an herbivore that was first discovered in New Mexico. Seismosaurus was 84 feet tall and 150 feet long, which is approximately half the length of a football field. This large dinosaur weighed 200,000 pounds. Skeletal fossils have not produced large limb bones; therefore, paleontologists surmise that the dinosaur may have had short legs for its stature.

Supersaurus is another diplodocid of the Late Jurassic period. This herbivore was 65 feet tall, 120 feet long and weigh in at approximately 120,000 pounds. A famous fossil skeleton of Supersaurus was found in 1972 in Colorado. This skeleton revealed a 39-foot long neck and a partial shoulder bone that was 8 feet long. This partial bone indicated the overall height of the dinosaur to be over five stories tall. Supersaurus had a long neck, tapered tail and a long, narrow head. The fossil skeleton found in 1972 was located near the fossil remains of another large dinosaur, Ultrasaurus.

One of the most popular dinosaurs, the Tyrannosaurus was a large carnivore that stood on two legs. Fossil skeletons discovered in North America and Asia indicates that Tyrannosaurus was 23 feet tall, 50 feet long and weighed 16,000 pounds. These dinosaurs were common in the late Cretaceous period. This dinosaur is very agile and can reach running speeds of 30 miles per hour. The Tyrannosaurus Rex species has been featured in more movies than any other dinosaur, often illustrating is powerful jaws and long, serrated teeth.|

Ultrasaurus is a large herbivore that lived in the Late Jurassic time. Paleontologists discovered this dinosaur in Colorado with Supersaurus. Ultrasaurus grew to heights of 53 feet and lengths of 100 feet and weighed approximately 140,000 pounds. This dinosaur looked similar to Brachiosaurus with a small head and short tail for its size. Ultrasaurus had a long neck, similar to a giraffe, and legs that looked like solid pillars.

Diplodocus is an herbivore that lived in the Late Jurassic time. A fossil skeleton was first discovered in the western United States. Diplodocus was 30 feet high, 89 feet long and weighed 55,000 pounds. Interestingly, Diplodocus has 15 bones in its neck and 70 to 90 bones in its tail. This dinosaur had a long nose with nostrils on top and one of the smallest brains of all dinosaurs. Diplodocus has longer legs in the back than the front, which helped it reach plants at different heights.

Barosaurus was a large herbivore that also lived in the Late Jurassic time. This rare dinosaur was another of the sauropods. Standing 40 feet height, Barosaurus was 79 feet long and weighed 50,000 pounds. The first Barosaurus was discovered in the South Dakota Black Hills with other fossil skeletons discovered in East Africa. Barosaurus is a relative of the diplodocus and looked similar; however, Barosaurus had a shorter tail and stouter legs.


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