Scientists have uncovered new clues to differentiate male and female dinosaurs through fossils. This discovery comes from research on tail injuries in hadrosaurs, duck-billed herbivorous dinosaurs that lived millions of years ago.
This research, published in the journal iScience, shows that the pattern of repeated injuries to the spine at the base of the tail is thought to occur due to the mating process. If the hypothesis is correct, this injury could be a new indicator of female sex in hadrosaur fossils.
Unique Injury Patterns in Hadrosaur Fossils
Paleontologists have been finding injury marks on hadrosaur fossils for decades. This injury appears in the form of fractures, skewed bones, and swelling at the back of the base of the tail. Interestingly, this fracture pattern appears uniform in many specimens from different locations and species.
According to Dr. Filippo Bertozzo from the Royal Belgian Institute of Natural Sciences, this injury most likely occurred during the mating process. During mating, the male hadrosaur allegedly mounted the female’s body which was positioned at an angle, resulting in pressure on the base of the tail which caused the injury.
Explanation of Detailed Simulation and Study Data
The mating hypothesis emerged as the most logical explanation because other activities such as fighting, predator bites, or walking accidents did not produce the same pattern of injuries consistently. The research involved the analysis of nearly 500 caudal vertebrae from museums in North America, Europe and Russia. As a result, the fracture pattern appears specifically in the middle of the tail base consistently in many fossils.
There is still an interesting side, the majority of fractures found are not fatal injuries. The bones show signs of healing and some even re-fracture after the first one heals. This suggests that female hadrosaurs were able to survive such repeated injuries during the mating process.
Challenges in Determining Sex Through Fossils
One of the main challenges in distinguishing between male and female dinosaurs is the absence of soft tissue in the fossils. Anatomical differences are often misinterpreted as age or species variations, rather than gender. Dr. Albert Prieto-Márquez of the Autonomous University of Barcelona called this injury pattern a “real biological signal,” but stressed that additional evidence is still needed.
Scientists are trying to look for other signs, such as the presence of medullary bone tissue, which is temporary tissue that appears in female animals just before laying eggs. The discovery of this tissue was previously recorded in a female Tyrannosaurus rex in 2016, but similar cases are very rare.
Potential Impact of the Discovery on Paleontological Studies
If this hypothesis is widely accepted, the research will open up huge opportunities in paleontology. Scientists can begin to differentiate between male and female hadrosaur fossils. This allows a more in-depth evaluation of variations in the shape of the crest or headdress that may be related to gender. In fact, some species previously thought to be distinct may simply be variations of different sexes.
In the next phase, the research team plans to expand the study to fossils from China and South America. They will also use advanced computer simulations to model tail movements as well as the volume of muscles involved during mating activity. This exploration is expected to reveal whether similar injury patterns are also found in other dinosaur groups such as long-necked sauropods.
Comments from Experts and Research Implications
Dr. Yoshitsugu Kobayashi from the Hokkaido University Museum appreciated this research as a modern breakthrough in paleobiology. He thinks that bone injuries can record “traces of the private lives” of dinosaurs, telling the story of their most intimate moments.
Likewise, Steve Brusatte from the University of Edinburgh stated that although this research is strong, there is still a level of uncertainty in the interpretation of dinosaur behavior from fossils. However, if verified, this finding literally records a dinosaur love story that has been lost in historical mystery.
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