12/3/2023 0 Comments T rex real bones![]() rex, colour a dinosaur with graffiti spray paint, or try the very exciting bike test: can you cycle fast enough to escape a ferocious T. How old was she? What animals where on the menu? And what do the fractures in her bones tell us about her life? Have a go at doing the courtship dance of a male T. In the exhibition, you will learn about the turbulent life of this impressive creature from the information revealed by her bones. rex skeletons are among the rarest fossils in the world. Frisian dinosaur expert Anne Schulp dug up the bones in America together with a team from the Naturalis Biodiversity Center in Leiden. rex in Town exhibition is a scientific model of a T. Journey 66 million years back in time on a whirlwind voyage of discovery in search of Tyrannosaurus rex – the King of the Cretaceous period. The thought that this creature actually walked the earth still fills us with awe. Other tyrannosaurs also have extreme growth patterns, "hatching out not much heavier than a house cat, and growing to the size of an elephant over 15 years or so," Schroeder said.Gigantic in size, enormous snout, razor-sharp teeth… Tyrannosaurus rex is one of the most fearsome carnivorous dinosaurs that ever lived. rex's growth from tiny tot to hulking adult. More is known about tyrannosaurs older than 2 years - for instance, for a study published in June in the journal PeerJ, a paleontologist exhaustively analyzed T. Related: Photos: Fossilized dino embryo is new oviraptorosaur species Embryonic fossils are rare, she told Live Science in an email, because "even before they were born, dinosaurs would have been under threat of predation from egg-stealing mammals, and had this baby tyrannosaur hatched, it likely would have had to avoid being eaten by dromaeosaurs ( Velociraptor-like dinosaurs), older tyrannosaurs, crocodilians and possibly even giant pterosaurs." But even without knowing the genus, "finding the remains of extremely young tyrannosaurs is very exciting," said Kat Schroeder, a doctoral student of biology at the University of New Mexico, who wasn't involved with the research but attended the conference presentation. It's a mystery which genus of tyrannosaur these fossils are from, but a few well-known predators from this group include Tyrannosaurus rex, Gorgosaurus and Albertosaurus. (Image credit: Gregory Funston 2020) Embryonic mysteries The newly studied tyrannosaur jawbone (third from top, but magnified at the bottom) is tiny compared with the jaws of a young Gorgosaurus tyrannosaur (top) and a juvenile Daspletosaurus (second from top). ![]() (The toe-claw fossil might also be from an embryo because one surface wasn't fully formed, Funston noted.) This style of replacement has recently been found in the first generation of teeth in reptile embryos." "In our case, the replacement tooth is beside the older tooth, and there's no evidence of root disintegration. ![]() ![]() "In one of the tooth sockets, a replacement tooth is being developed, but in an unusual way: Typically, replacement teeth lie directly below the older tooth, and they eat away at the root to release the older tooth," Funston said. The teeth on the jawbone aren't fully developed, and one tooth in particular offers clues that this fossil might belong to an embryonic tyrannosaur, meaning the tiny tyrannosaur would have died before it had hatched. A hypothetical cranial reconstruction based on the newly analyzed jawbone (blue), next to other hypothetical reconstructions from other datasets (left and right), indicates that embryonic tyrannosaurs had heads about the size of a modern mouse.
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