Dinosaurs also climbed first and stood later

dinosaur may have been the first to walk on four legs.
babies need months to crawl to get up on their own, and that may be true for some dinosaurs. A fossil analysis has revealed a dinosaur that may have walked on all four limbs during the "childhood" and grew up walking on two legs. The results were published in Scientific Reports.
andrew Cuff, of the Royal College of Veterinary Medicine, said humans may be the only animal in the world that has gone from crawling with four feet to walking on two feet. "It's exciting to find another example, especially in very different species like dinosaurs that are extinct."
200 million years ago, Patagonia rodents lived in what is now Argentina. The adult Patagonia rodent has a long neck and tail and weighs up to 1 ton. However, when the dinosaur first hatched, it weighed only 60 grams, like a newborn chicken.
To see if the dinosaur's walking posture changed with its size, Cuff and colleagues used the fossils of patagonia to reconstruct three-dimensional models of its three life stages: cubs, one-year-olds and adults.
that determines whether an animal can walk mainly on two feet is its center of gravity. The center of gravity must be above both hind legs, not forward.
team found that the Patagonia dragon cub's center of gravity was in the middle of its back and the front of its legs, meaning it had to stand with its limbs to maintain balance.
as the Patagonia rodents get bigger, their center of gravity gradually moves back, and the tail plays a big role. The center of gravity of the adult Patagonia rodent is so close to the hips and legs that it can walk with two feet.
"It's very rare to change posture through growth. Cuff said. A previous study found that earlier prosthyropods, long vertebrates, may have undergone the same transformation. However, it is not clear whether this was a common trend in dinosaurs