It has also been discovered that Tyrannosaurus underwent the most extreme changes in growth as it aged of any dinosaur genus: Tyrannosaurus juveniles had long, narrow snouts and sharp, blade-like teeth for cutting and slicing meat unlike their bone-crushing parents. However, due to the fact that larger animals retain body heat better than smaller animals and skin impressions found from some Tyrannosaurus specimens, the current theory and consensus is that Tyrannosaurus was purely scaly due to its ancestors having lost feathers as they grew larger over their evolution to prevent overheating. It has also been proven that the Tyrannosaurus may have had feathers along its back, neck and head just as many dinosaurs did due to discoveries from China regarding smaller relatives such as the 2-meter (6 feet) Dilong paradoxus and the 9-meter (30 feet) Yutyrannus. Additionally, at the time, two fingered hands had not been known in Tyrannosaurus rex, with the discovery only being proven for certain in the 1990's. Why it was portrayed with such an inaccuracy is because Walt Disney reported to Barnum Brown, the discoverer of Tyrannosaurus rex, that it looked scarier that way. Unlike in Fantasia, Tyrannosaurus rex did not have three fingers it only had two. This puts a gap between the two species that is larger than the one that separates Tyrannosaurus rex from humans! In the southwestern part of its range, Tyrannosaurus did encounter the giant sauropod Alamosaurus, a titanosaur that was one of the largest dinosaurs that ever existed, being roughly 110 feet long and well over 70 tons, so its being portrayed as living alongside sauropods in Fantasia and other Disney films and series is not inaccurate. Thus, it did not coexist with any species of Stegosaurus, which lived in the Tithonian stage of the Late Jurassic Period, from 156-145 million years ago. ![]() In real life, Tyrannosaurus rex, weighing 6-10 tons and measuring 39–43 feet (12–13 meters) long, belonged to a genus of theropod dinosaurs aptly named the tyrannosauridae that lived in the Campanian to Maastarichtian stages of the Late Cretaceous Period, about 80-66 million years ago. In other appearances, Tyrannosaurus is often depicted as being colored red, brown or gray and is portrayed correctly with two fingers. Walt Disney himself knew that the real Tyrannosaurus had only two fingers, but thought a three-fingered portrayal would look scarier. ![]() The one in Fantasia is incorrectly shown with three fingers, while the actual dinosaur only had two. ![]() The Tyrannosaurus was portrayed as a huge dark blue/purple/gray carnivorous dinosaur with a big square head and a mouth full of long, razor-sharp teeth. 2.7 Pooh's Grand Adventure: The Search for Christopher Robin.
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