Feathered Tail Preserved In Amber Belonged To A Baby Dinosaur

By Kim Bussing on January 8, 2017

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The amber specimen containing coelurosaur tail ( (Photo Credit Royal Saskatchewan Museum (RSM/ R.C. McKellar)

In 2015, while browsing at a market in Myanmar, Lida Xing, a paleontologist at Beijing’s China University of Geosciences, was offered a piece of amber. Believed to contain a preserved plant, it was meant for use as jewelry. Suspecting that the semitranslucent precious stone was harboring something more valuable, the scientist convinced the Dexu Institute of Paleontology to purchase it.

He was right. Alongside the insect and plant debris trapped inside the apricot-sized stone was a tail. Measuring 1.4-inches long, it was covered in delicate feathers that were reddish-brown along the upper surface and paler underneath. Microscopic examinations and CT scans revealed eight complete vertebrae encased by soft tissues like skin, ligaments, and muscles. The researchers suspect that the slim fossil is probably the middle or end of a longer tail that comprised more than 25 vertebrae.

Microscopic barbules on tail feathers in the specimen. (Photo Credit Royal Saskatchewan Museum (RSM/ R.C. McKellar)

The structure of the tailbone, which consisted of a string of vertebrae, eliminated the possibility that the fossil may have belonged to a prehistoric bird. That’s because modern birds and their closest Cretaceous ancestors have fused tail vertebrae, or pygostyles, that enable tail feathers to move as a single unit. Also, the feathers were different from those of Cretaceous-era birds. Instead of spurting from a strong central shaft, called a rachis, they were fuzzy barbs that were probably ornamental and used for temperature regulation and camouflage, rather than flying.

Xing and Ryan McKellar, a paleontologist at Canada’s Royal Saskatchewan Museum, who co-wrote the study published in Current Biology in December 2016, believe that the tail belonged to a non-avian dinosaur, most likely a juvenile coelurosaur that roamed our planet 99-million years ago. Though related to the fierce velociraptors and the Tyrannosaurus rex, the tiny coelurosaur, which could easily fit inside a human palm, had more in common with birds.

Artist’s rendition of a juvenile coelurosaur (Image Credit: Chung-tat Cheung and Yi Liu

The scientists speculate the little dinosaur, nicknamed “Eva,” most likely got a portion of its tail stuck in tree resin. Since dinosaurs could not shed their tails like lizards, it probably died soon after. The resin hardened into amber and kept the tail in pristine condition for millions of years.

While researchers have previously found fossilized dinosaur feathers, they have always been compressed and distorted, making it difficult to recreate 3D images of the animal. Additionally, the lack of skeletal fossils made it impossible to identify the species associated with the feathers. “Eva” is the first non-avian dinosaur bone, muscle, and feathers all found in one place.

The delicate feathers that cover the dinosaur tail. (Photo Credit: Lida Xing)

Interestingly enough, it was an amber-preserved mosquito with dinosaur blood in its belly which led to the cloning of the ancient creatures in the Jurassic Park. Thankfully, McKellar and Xing, who also found feathers from two Cretaceous-era birds encased in amber at the same market, have no such aspirations. They just want to use the discoveries to further our knowledge of dinosaurs.

Resources: Nationalgeographic.com, theverge.com,sciencemag.com,sciencedaily.com

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Article Comprehension (8 questions)

  1. Why was Lida Xing offered an amber in Myanmar?
  2. Why did he ask Dexu Institute of Paleontology to buy it?

Critical Thinking Challenge

Why would it not be a good idea to resurrect dinosaurs even if they...

Vocabulary in Context

“Suspecting that the semitranslucent precious stone was harboring something more valuable, the scientist convinced the Dexu Institute of Paleontology to purchase it.”


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  • lemonade11
    lemonade11Sunday, January 22, 2017 at 7:02 pm
    Now that is really cool! I am going to show my science teacher this article and see what she thinks. My cousin is like some crazy dinosaur person and I will show him this too! That is so COOL though!
    • iineo_sparksii
      iineo_sparksiiSunday, January 22, 2017 at 5:51 pm
      I am doing a project on this article. This is really cool. This is going to be the best Current Event yet! Why? Because this will have a lot of animations in it, like bird talking, or words coming out of no where.
      • emmie25
        emmie25Sunday, January 22, 2017 at 12:40 pm
        This is my favorite news story on this website yet... I love to learn about dinosaurs.
        • connerp
          connerpSunday, January 22, 2017 at 8:16 am
          • BreezyFriday, January 20, 2017 at 3:08 pm
            I'm Making This My Current Event In School
            • i love catsFriday, January 20, 2017 at 11:44 am
              so cool that im using this for my current event
              • annaFriday, January 20, 2017 at 11:41 am
                I'm using this for my current event because it's so interesting
                • OverwatchFriday, January 20, 2017 at 10:22 am
                  How come we never known that before
                  • Dabinator2Friday, January 20, 2017 at 10:20 am
                    thats a cool looking dinosaur
                    • AlexanderFriday, January 20, 2017 at 10:20 am
                      Cool dino,yeah cool

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