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Scientists discover perfectly preserved dinosaur embryo

Believed to be between 66 and 72 million years old, the fossil was found in southern China and offers new insight into the very first stages of animal life on Earth.

On Tuesday, scientists announced the discovery of the most complete dinosaur embryo ever found, tucked into a position that’s strikingly similar to today’s unhatched chickens.

Found in the Late Cretaceous rocks of Ganzhou in southern China, the fossil – which has been dubbed β€˜Baby Yingliang’ – belongs to an oviraptorosaur (a group of beaked therapod dinosaurs closely related to modern birds) and is believed to be between 66 and 72 million years old.

Likely preserved by a sudden mudslide that buried it and protected it from scavengers, it would have grown two to three metres had it lived to be an adult and would probably have fed on plants.

β€˜It’s one of the best dinosaur embryos ever found in history,’ Fion Waisum Ma, one of the researchers, told AFP, adding that while many dinosaur eggs have been found, embryos are rare – and well-preserved embryos are even rarer still. β€˜Dinosaur embryos are some of the rarest fossils and most of them are incomplete with the bones dislocated.’

Though the egg was actually acquired in 2000 by stone mining company Yingliang Group, another 15 years passed before anyone acknowledged its significance, when a few fragile bones exposed by a crack in its surface hinted at what lay beneath.

For other fossils, scientists have used CT scans to reveal details of the bones hidden inside, however, the type of sediment filling the egg made it difficult to discern the bones from the background.

Yet the team was able to carefully study the exposed surface of the fossil, comparing it to two other oviraptorosaur embryos they’d previously found.

The 27-cm-long embryo, lying with its head below its body, feet on either side, and back curled, demonstrates a distinctive posture previously unseen in dinosaurs.

In modern birds, such postures are related to an act called β€˜tucking,’ which is a behaviour controlled by the central nervous system and critical for hatching success. Chicks preparing to hatch tuck their head under their right wing in order to stabilise the head while they crack the shell with their beak. Those which fail to do so have a higher chance of death.

This indicates that such behaviour in modern birds first evolved and originated among their ancestors, giving scientists a greater understanding of the link between them.

β€˜Most known non-avian dinosaur embryos are incomplete with skeletons disarticulated,’ continues Ma. β€˜We were surprised to see this embryo lying in a bird-like posture. This posture had not been recognised in non-avian dinosaurs before.’

The team hopes to study the ancient infant in greater detail using advanced scanning techniques to image its full skeleton, including its skull bones, because part of the body is still covered by rock.

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