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Perfectly Preserved Dinosaur Embryo Found Inside Fossilized Egg

by Stephen King 4 Comments

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Scientists in China have unearthed an astonishing find: an exceptionally well-preserved dinosaur embryo, affectionately nicknamed “Baby Yingliang.” This remarkable fossil, estimated to be between 66 and 72 million years old, was discovered nestled within a fossilized egg and is hailed as one of the most complete dinosaur embryos ever brought to light. Measuring approximately 27 centimeters in length, the delicate embryo belongs to an oviraptorosaur, a fascinating group of feathered theropods that share a close evolutionary relationship with modern birds.

What renders the discovery of Baby Yingliang particularly captivating is the distinct curled posture of the embryo within the egg. This positioning bears a striking resemblance to the way modern bird embryos arrange themselves in preparation for hatching. This uncanny similarity strongly suggests that certain behaviors observed in contemporary birds may have their origins in their ancient dinosaur ancestors. Indeed, “Baby Yingliang” offers an unprecedented and intimate glimpse into the evolutionary thread that connects the mighty dinosaurs of the past with the familiar birds that grace our skies today. Currently, this precious fossil is on display, inviting awe and wonder, at the Yingliang Stone Nature History Museum.

Intriguingly, this extraordinarily rare and completely articulated dinosaur embryo was found inside a fossilized egg that had remained largely unnoticed, accumulating dust within a museum storage space in China for over a decade. This fetal specimen, with its age placing it in the late Cretaceous period, provides compelling evidence for the deep evolutionary links between dinosaurs and the birds we see today.

The unhatched creature, identified as an oviraptorosaur, is believed to have been around 27 centimeters (10.6 inches) long. Significantly, it represents the first instance of a non-avian dinosaur embryo exhibiting a posture strikingly similar to that of modern bird embryos just before hatching. Oviraptorosaurs were a diverse group of feathered, typically toothless theropods. Modern birds engage in a specific sequence of tucking movements prior to hatching, involving bending their bodies and positioning their heads beneath their wings. Until this discovery, the evolutionary roots of this behavior remained largely unclear.

According to the study’s authors, who published their findings in the journal iScience, Baby Yingliang’s head was found positioned ventrally to its body, with its feet situated on either side, and its back elegantly coiled around the blunt pole of the egg. They assert that this posture, previously unknown in a non-avian dinosaur, is remarkably “reminiscent of a late-stage contemporary bird embryo.”

The oviraptorosaur embryo known as Baby Yingliang. Image: Xing et al., 2021

The fact that birds are known to tuck during the crucial hatching process, and that those who fail to do so have a significantly reduced chance of successfully emerging from their shells, adds further weight to the significance of Baby Yingliang’s posture. The apparent adoption of this same position by this ancient embryo raises the intriguing possibility that this fundamental behavior originated within the theropod ancestors of present-day birds.

Reacting to this exciting discovery, research author Professor Steve Brusatte remarked, “This small prenatal dinosaur looks just like a baby bird curled in its egg, which is yet more evidence that many features characteristic of today’s birds first evolved in their dinosaur ancestors.”

This image released by the University of Toronto shows field crew and volunteers working at the Dawa embryonic bonebed site near the city of Lufeng, in Yunnan, China. An international team of scientists discovered a cache of dinosaur embryos estimated to be 190 million years old, the fossilized bones are among the oldest dinosaur embryos in the world. (AP Photo/University of Toronto, R. Reisz)

Baby Yingliang, now a prized exhibit at the Yingliang Stone Nature History Museum, stands as one of the most complete dinosaur embryos ever discovered.6 Its pristine condition offers scientists an unparalleled opportunity to study an uncompromised young theropod. While the study’s authors acknowledge that definitive conclusions about the broader nature of dinosaur embryos cannot be drawn solely from this single, unique fossil, they emphasize the profound implications of their findings. Further research on similar specimens, should they be discovered, will be crucial for validating these initial insights.

Reconstruction of a close-to-hatching oviraptorosaur dinosaur embryo, based on the new specimen “Baby Yingliang”. Image credit: Lida Xing

Nevertheless, their current conclusion is compelling: “This new remarkable fossil embryo implies that several early developmental characteristics (tucking) generally assumed to be exclusively avian may be anchored more deeply in the theropod lineage.” Baby Yingliang, the exceptionally well-preserved dinosaur embryo, is not just a fossil; it is a window into the past, illuminating the intricate evolutionary journey that connects dinosaurs to the birds that soar above us today.

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Reader Interactions

Comments

  1. Josef says

    January 8, 2023 at 5:26 pm

    Amazing!

    Reply
  2. Larry B-o-b says

    January 25, 2023 at 9:49 am

    Sure. Dinosaurs. Are. Real. So. Is. Good. God. Above. He. Made. Mee. He. Made. You. True. Blue. And. Beautiful!!

    Reply
  3. Barbara says

    January 31, 2023 at 4:36 am

    Awesome…..and very interesting!!

    Reply
  4. Mike Oppenheim says

    July 17, 2024 at 10:42 pm

    It looks amazing, but it’s an artist’s reconstruction. What the paleontologists saw was a clump of fossilized bones..

    Reply

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