Every child, before walking, passesthrough the crawling stage on all fours - oddly enough, not all animals can boast of this feature of development. Paleontologists from the University of London studied the remains of a new-born, one-year-old and adult Muszaur dinosaur (Mussaurus patagonicus) and found that during the first months of his life he could not fully walk because of uneven body weight. It turns out that, like people, for a while he had to crawl on all fours.
Viewed dinosaur species lived around 200million years ago in modern Argentina. Paleontologists are very lucky - over the past 50 years they have managed to collect fossils of an ancient creature of different ages. According to Professor John Hutchinson, thanks to these remains of Muszavr, they were able to make a discovery, which was simply impossible 20 years ago.
According to their calculations, the dinosaur cub weighed 60grams, and could fit in the palm of a man. At this age, the creature had relatively large head and neck, but well-developed forearm - the center of mass of its body was directed forward, so the cub could move only on all fours.
The situation changed as they grew up - whenthe dinosaur's larger tail moved the center of gravity to the pelvic region, he could well stand on two legs. According to researchers, at the stage of maturity, the dinosaur already had almost 6 meters in length and weighed more than 1000 kilograms.
Due to the lack of fossils of other dinosaurswith a long neck, paleontologists cannot say for sure whether they have gone through the same stage of crawling. Probably, most of them went on all fours all their lives, not standing up on two legs due to the severity of the long neck. Exceptions could be considered Muszavr, Iguanodon and Psittacosaurus.
The new discovery made it clear that in the opportunityWalking on two legs played a role not only in the balance between the length of the hind and fore limbs, but also the length of the tail and neck. Based on this knowledge, paleontologists will be able to reveal the characteristics of the development of other types of dinosaurs.
On the subject of dinosaur development, we also recommend reading the material on how they learned to fly. The robotic skeleton of the caudipteryx predator helped to answer this question.
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