Late bird dinosaur5/28/2023 ![]() ![]() The search for skulls from early birds and closely related dinosaurs has been challenging paleontologists for centuries. "If a feature of the brain affected survivorship, we would expect it to be present in the survivors but absent in the casualties, like Ichthyornis," said Torres. That pattern suggests that these functions could be connected to surviving the mass extinction. In particular, the cerebral hemispheres-where higher cognitive functions such as speech, thought and emotion occur in humans-are much bigger in living birds than in Ichthyornis. The researchers found that the brain of Ichthyornis had more in common with nonavian dinosaurs than living birds. They compared that endocast with ones created for living birds and more distant dinosaurian relatives. With CT-imaging data, the researchers used the skull of Ichthyornis like a mold to create a 3D replica of its brain called an endocast. Credit: Christopher Torres / The University of Texas at Austinīird skulls wrap tightly around their brains. This suggests that brain differences may have affected survival during the mass extinction that wiped out all nonavian dinosaurs. The ancestors of living birds had a brain shape much different from other dinosaurs (including other early birds). The intact skull let Torres and his collaborators get a closer look at the brain. Ichthyornis has a blend of avian and nonavian dinosaur-like characteristics-including jaws full of teeth but tipped with a beak. The fossil is a new specimen of a bird named Ichthyornis, which went extinct at the same time as other nonavian dinosaurs and lived in what is now Kansas during the late Cretaceous Period. ![]() The findings were published July 30 in the journal Science Advances. The fossil is about 70 million years old and has a nearly complete skull, a rare occurrence in the fossil record that allowed the scientists to compare the ancient bird to birds living today. "This new fossil finally lets us test the idea that those brains played a major role in their survival." from the UT College of Natural Sciences and is now a National Science Foundation postdoctoral fellow at Ohio University and research associate at the UT Jackson School of Geosciences. "Living birds have brains more complex than any known animals except mammals," said lead investigator Christopher Torres, who conducted the research while earning a Ph.D. ![]() Research on a newly discovered bird fossil led by The University of Texas at Austin found that a unique brain shape may be why the ancestors of living birds survived the mass extinction that claimed all other known dinosaurs. ![]()
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