A bird kept in a museum drawer for years began attracting attention after close examination revealed an unusual tail structure. The fossil belongs to Plumadraco bankoorum, a small bird that lived about 121 million years ago in what is now northern China.
It was stored among the remains of other birds before its dimensions were re-examined. According to Discover magazine, the body appears modest in size, while the tail feathers extend far beyond what would normally be expected for a bird of this size.
Ancient bird fossil reveals unexpected feather structure
The fossil belongs to a larger collection of ancient bird fossils housed in the Chinese Museum. The fossil was not subject to any examination for some time before the researchers decided to examine the collection again.
This examination led to a closer look at the tail section, where it was noted to have unusually long feathers despite its advanced age and deteriorated condition.Various parts of a bird’s skeleton are not complete and may be fragmentary, but its feathers still retain more information about the bird, enabling the researcher to observe details of the structure of the bird’s feathers. Plumadraco Bankoorum is among the enantiornithes, which represent one of the oldest bird species that coexisted with non-avian dinosaurs in the Cretaceous period.
This species of bird showed a large number of different morphological traits and adaptations.
It is worth noting that many species of this type of bird had teeth, which is not observed among birds in the modern era.This entire group of enantiornithes became extinct at the end of the Cretaceous. Their fossils can be discovered all over the world. In addition, fossils of this bird group are usually well preserved in sediment layers containing remains of bird feathers.
Proportions and structure of tail feathers
The most distinctive feature of the Plumadraco Bankoorum is the relative length of its tail feathers compared to its body. It is estimated to have a similar body size to a modern robin, while its tail feathers extend to approximately twice that length.One of the feathers in the specimen was almost completely preserved, which is rare for fossils of this age. The structure of the feathers shows narrow, elongated shapes with pointed ends. Some sections appear stiffer, indicating limited flexibility along the tail segments.
The tail region of the fossil reveals key clues about the appearance of early birds
Microscopic chemical traces in the feathers indicate darker pigmentation. The preserved material indicates undertones likely to be compatible with brown or black. The skeletal remains are less complete than the feather impressions, with only some areas of the body partially preserved.The tail section provides the clearest anatomical information, including the arrangement of the feathers and structural alignment along the shaft. These features allow observation of shape without complete reliance on skeletal reconstruction. This species lived during the Early Cretaceous period in an area that included wetlands, seasonal water systems, and mixed vegetation. Fossil evidence from the same formations includes turtles, small reptiles, gastropods, and early theropod dinosaurs.
