A joint Chinese–American research team led by Dr. HU Han from the Chinese Academy of Sciences and Dr. Jingmai O’Connor from the Field Museum of Natural History has unveiled the 14th known specimen of Archaeopteryx, dubbed the Chicago Archaeopteryx. Published in Nature in May 2025, the study leverages advanced imaging techniques to uncover unprecedented details about this iconic “first bird,” shedding light on its skull evolution and adaptations for flight during the dinosaur-to-bird transition.
The Chicago Archaeopteryx, acquired by the Field Museum in 2022, is the smallest specimen discovered to date—about the size of a pigeon. Its exceptional preservation allowed researchers to use high-resolution CT scanning and 3D reconstruction to analyze skeletal and soft tissue structures in remarkable detail. The skull, nearly complete with an intact palatal region, reveals an intermediate morphology between non-avian theropods and later birds, offering critical insights into the evolution of avian skull mobility.
Beyond bones, the specimen preserves rare soft tissues, including toe pads resembling those of modern ground-foraging birds. This suggests Archaeopteryx may have had a mixed lifestyle, moving both on the ground and in trees. Additionally, the discovery of tertials, feathers attached to the wing bones, marks the first time such structures have been observed in Archaeopteryx. These feathers likely contributed to aerodynamic surfaces, hinting at evolutionary innovations toward powered flight.
Dr. Jingmai O’Connor noted, “This specimen is a game-changer. The preserved soft tissues and 3D skull structure provide a window into how Archaeopteryx lived and evolved.”
The Chicago Archaeopteryx not only deepens our understanding of early bird evolution but also showcases the power of modern paleontological techniques. By combining cutting-edge technology with exceptional fossil preservation, the study paves the way for future research into the biomechanics and ecology of extinct species.
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