rex and birds had hollow bones and air sacs, and some members of the tyrannosaurid family even had feathers. rex specimen was 28 when it died and suffered many injuries over its lifetime.īirds are actually a type of dinosaur from the same group as T. Based on growth rings in fossil bones, scientists know that the longest-lived T. rex may have increased its size by up to about 1,500 pounds per year during the middle of its “teenage” growth spurt.Īfter reaching its adult size, a T. rex grew much faster than typical reptiles do today, and scientists estimate that it reached its full size in less than 20 years. They belonged to different families of predatory dinosaurs than T. Other species, such as Carcharodontosaurus, Giganotosaurus and Spinosaurus, were similar in size but lived earlier in the Cretaceous Period. rex was certainly the biggest two-legged predator in its Late Cretaceous ecosystem, and it was one of the largest predators ever to live on land. rex replaced the original grabbing function of its arms, which could then have evolved for other uses. Another theory is that the enormous head of T. rex’s arms became shorter as its head grew more massive to prevent the dinosaur from becoming top-heavy. rex used its arms, but they know that they were too short to help with eating. rex’s arms were powerfully muscled and ended in two mobile fingers with large claws. Still, 15 mph was fast enough to hunt down other large dinosaurs, most of which were designed for even slower movement. rex did not run but walked at speeds up to 15 mph. Recent computer models and other evidence suggest that T. rex had a good sense of smell, much like other predatory dinosaurs. rex’s olfactory bulbs (the part of the brain used to process smell) were large, and scientists believe that T. Because of its forward-facing eyes, it might have had better depth perception than most other predatory dinosaurs. rex had senses that were similar to those of its close relatives, birds and crocodiles. rex skulls and teeth reveal that it was a meat eater, and judging from its size, it could have eaten whatever animal it could catch or scavenge. Lush plant life supported a diverse animal community ranging from dinosaurs to mammals to insects. The global climate was also warmer than it is now. rex was alive?Īlthough the current landscape of Wyoming and Montana is dry and grassy, it probably resembled a Louisiana floodplain when T. rex lived about 66–68 million years ago during the Cretaceous Period in the western United States, including Montana and Wyoming. So, Tyrannosaurus rex was “King of the Tyrant Lizards.” “Tyrannosaurus” is Greek for “tyrant lizard,” and “rex” means “king” in Latin. What does the name “ Tyrannosaurus rex” mean? Eliot Elisofon Photographic Archives, African Art.The Velociraptor’s hands were grabbing the head shield of the Protoceratops, while its sickle claw appears to be lodged deep into the body cavity. Paleontologists uncovered a Velociraptor apparently embroiled in a fight to the death with a Protoceratops. Dinosaur Bones Hard for Evolutionists to Explain Since the researchers believe these fossils are 50 to 70 million years old, they need to explain how fragile biological molecules can survive so long. A team in Sweden showed that collagen has survived in the fossilized bone of a mosasaur. The findings support the view that these dinosaurs lived only 4,300 years ago and were buried during the global Flood.Ī team in England confirmed the existence of soft skin tissue, known as keratin, in fossilized lizard skin. The survival of DNA within dinosaur bones would be powerful evidence against a millions-of-years age for those fossils.
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