WAS SHINGTON (Reuters) – Large carnivorous dinosaurs can achieve great size through a variety of growth strategies, with some adopting slower and more stable paths and others experiencing increased growth in adolescence, scientists say. Is.
The researchers examined the annual growth rings – which resemble tree trunks – in the bones of 11 species of theropods, the Tyrannosaurus rex and even a large group of all large carnivorous dinosaurs, including birds. This study gives an insight into the lives of some of the most terrifying predators ever to walk on Earth.
The team saw samples from museums in the United States, Canada, China and Argentina, and the world’s most famous T.I. Rex also obtained permission to cut bones from fossils, known as Sue, and is housed at the Field Museum in Chicago. A diamond-tipped saw and drill
The bones of the golden leg – a giant femur and fibula – helped to explain that T. Rex and his relatives, who experienced a period of extreme growth during the oppressed population and reached adult size around 20 years old. About 33 years.
The dinosaurs and many other species inhabited the South Dakota about a million years ago, were destroyed by the asteroid impact 66 million years ago.
Other groups of larger theropods have longer stable rates of growth. The growth strategy was traced to a worldwide lineage at the beginning of the dinosaur era and was later concentrated in the southern continents.
Examples include Allos ur juice and roc crocanthos ur juice from North America, Crylophos us juice from Antarctica, and a recently-discovered species from Argentina called T. Has the size of a rack. The Argentine dinosaur, from a group called Carcharodontosaurus, did not reach its adult size for 40 years and lived to be about 50 years old.
Large theropods share the same body design evenly, walk on two legs and can boast large skulls, strong jaws and toothed teeth.
“Prior to our study, it was known that T. rex evolved very rapidly, but it is not clear whether all throbop dinosaurs reached similarly large sizes, or if there were a lot of ways,” said Carol of the Carolina Museum. Tom Cullen, author of Natural Sciences and North Carolina State University, is also affiliated with the Field Museum.
The research was published this week in the Proceedings of the Royal Society B: Journal of Biological Sciences.
“Theropod dinosaurs represent the largest bipedal animals ever and have been predominant predators in terrestrial ecosystems for 150 million years – more than twice as impressive as mammals,” added University of Minnesota paleontologist and study Peter Makovic.
(Reporting by Will Dunham; Editing by Peter Cooney)
Copyright Thomson Reuters 2020
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