Rare 66-million-year-old fossil of a baby dinosaur in its egg, apparently just a few days before it would hatch, highlights link to modern birds, according to new study.
A 66-million-year-old fossil of a complete baby dinosaur in its egg, apparently just a few days before it would have hatched, shows the remarkable similarities between theropod dinosaurs and the birds they would evolve into, according to a study published Tuesday.
Embryonic dinosaur fossils are extremely rare — paleontologists have found them at only about half a dozen sites. And this is the first time any have shown signs of a distinctive posture known as “tucking” — with the head under the right arm — although some other dinosaur embryos have shown distinct “egg teeth” that they may have used to break out of their shells, Nudds said.
Ma said tucking seems to help baby birds make their first cracks in the eggshells by restricting the movement of their heads. Baby Yingliang was in a cache of fossils that were delivered in 2000 to the Yingliang Stone Nature History Museum in the Chinese city of Nan’an, possibly after they had been found at a construction site in the nearby city of Ganzhou.
The study suggests that the fossil is 66 million to 72 million years old. The baby dinosaur would have been about 10 inches from beak to tail when it was hatched, and it might have grown to more than 6 feet long as an adult.
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