Every child, before going, passes through the stage of crawling on all fours — oddly enough, this specific development can boast, not all animals. Paleontologists from the University of London, examined the remains of the newborn, yearling and adult dinosaur mussara (Mussaurus patagonicus) and found that in the first months of his life he was not able to walk due to uneven body weight. It turns out that like people, some time he had to crawl on all fours.
Consider the kinds of dinosaurs lived about 200 million years ago in modern Argentina. Paleontologists were very lucky for the past 50 years they were able to collect fossils of ancient beings of different ages. According to Professor John Hutchinson, thanks to these remains of mussurov, they were able to make the discovery, which 20 years ago was simply impossible.
According to their calculations, a baby dinosaur weighed 60 grams and could fit in the palm of a person. At this age, the creature had a relatively large head and neck, but well-developed forearm center of mass of his body was facing forward, so the calf could only move on all fours.
The situation was changing as they grow older — when increased the dinosaur’s tail was moved to the center of gravity in the pelvis, he could stand on two legs. According to researchers at the stage of growing the dinosaur already had almost 6 metres in length and weighed over 1000 pounds.
Due to the lack of fossils of other dinosaurs with a long neck, paleontologists can’t say exactly, have they passed through the same stage of crawling. Probably most of them walked on all fours all his life, not getting up on two legs because of gravity long neck. Exceptions could be considered Mussar, iguanodon and psittacosaur.
A new discovery made clear that the ability of walking on two legs was playing the role of not only the balance between the length of the front and rear extremities, but also the length of the tail and neck. Based on this knowledge, paleontologists will be able to reveal the peculiarities of development and other types of dinosaurs.
On the topic of dinosaurs we also recommend you to read the material on how they learned to fly. To answer this question helped the robotic skeleton predator caudipteryx.