Sauroposeidon is a somphosondylian sauropod dinosaur known from the southern USA during the Early Cretaceous. At 17-18 metres (56-59 ft) tall, it is possibly the tallest dinosaur ever known to science.
Extrapolations based on the more completely known Brachiosaurus indicate that the head of Sauroposeidon could reach 16.5–21 m (54–69 ft) in height with its neck extended, which would make it one of the tallest known dinosaurs.
Sauroposeidon was massive and probably grew to 18.5 metres tall making it the tallest dinosaur.
Tyrannosaurus rex - found in North America - 40-50 feet long (12-15 m), 6 tons in weight.
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.
Dreadnoughtus weighed more than seven T. rex but a blue whale weighs the same as 30 T. rex.
Up to 40 feet in length and 12 feet in height.
Based on fossil specimens, scientists have determined that a Tyrannosaurus rex could be up to 40 feet long and 12 feet high. T. rex is estimated to have weighed between 11,000 and 15,500 pounds (5,000 and 7,000 kilograms) with skin and flesh on its huge bones.
Bigger than Tyrannosaurus rex, Spinosaurus lived during the Cretaceous era between 145.5 and 65.5 million years ago, which was the last period of the Mesozoic Era following the Jurassic Era and ending with the extinction of dinosaurs, except birds.
Adult Velociraptors grew up to 6.8 feet (2 meters) long, 1.6 feet (0.5 meter) tall at the hip and weighed up to 33 lbs.
of one very big extinct animal, Tyrannosaurus rex. The most famous of the upright, largely meat-eating dinosaurs called theropods, T. rex would have weighed between 5,000 and 7,000 kilograms (11,000 to 15,500 pounds) with skin and flesh on its huge bones. That's about as much as the largest African elephant.
#2 World's Largest Dinosaurs Ever: Supersaurus vivianae – 112-feet long. Supersaurus is a genus of diplodocid sauropod dinosaur that lived in North America during the Late Jurassic period.
The huge size of each suggests the dinosaur was a very large titanosaur—one that might be bigger than Argentinosaurus. That claim cannot be confirmed, however, until leg bones are found. Their size will allow the researchers to make estimates of the animals' body weight.
Its name, Spinosaurus, means “spine lizard.” This refers to the large, spiny, fin-like sail on top of its back, at least 6 feet tall. The Spinosaurus is the largest carnivorous dinosaur we know of.
Brachiosaurus was an unusual dinosaur that lived 155.7 million to 150.8 million years ago during the mid- to late Jurassic Period. Specimens have been found primarily in the fossil-rich Morrison Formation in North America, but the dinosaur did not resemble any of the others that roamed the region.
The length of Brachiosaurus has been estimated at 20–21 meters (66–69 ft) and 18 meters (59 ft), and its height at 9.4 meters (30+3⁄4 ft) and 12–13 meters (39–43 ft).
At an estimated maximum length of roughly 15 metres, Spinosaurus was the largest of all known theropod dinosaurs. This enormous, strange-looking theropod prowled the coastal plains of northern Africa, 100–95 million years ago.
The new dinosaur, dubbed Siats meekerorum, is part of a group of giant predators known as carcharodontosaurs, and it's only the second of this group to be discovered in North America.
T. Rex adults were a significantly larger compared with allosaurus adults. An allosaurus adult was between 8.5 and 12m in length (28-39 ft), while the average T. Rex adult was about 12-15m long (40-50 ft).
The Struthiomimus may have been the fastest dinosaur. It could run up to 60 miles per hour! The Liaraptor ran until it took off into the air! These may have been the first dinosaurs to fly!
Mammoths were much more heavily built and while in height and length they were smaller, they were wider and heavier than T. Rex. Also, while T. Rex did pray on animals the mammoth's size or larger, the closest comparison is the triceratops with the forward facing horns.
SIZE: Giganotosaurus measured 45 feet long, 12 feet tall and weighed more than 8 tons. It is the biggest two-legged creature ever unearthed and the largest carnivore to date.