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What made this Archaeopteryx fossil special?
Archaeopteryx lived about 150 million years ago in the Jurassic. It was both an early bird and a feathered dinosaur; the Chicago specimen is the 14th known fossil of the animal. The fossil came from the Solnhofen Limestone deposits near Solnhofen, Germany.
The Field Museum says a private collector found it before 1990. It remained in private hands from 1990 until the museum acquired it in August 2022 with help from supporters. Much of the skeleton was still hidden in limestone when it arrived. Museum preparators spent more than a year exposing it, and the specimen went on public display in 2024. Field Museum
“Nearly complete and uncrushed” is more accurate than “intact”: the fossil preserves much of the skeleton and fine details, but it is not an untouched, complete animal. Its condition let researchers examine features that are difficult to make out in other Archaeopteryx fossils.
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How did researchers uncover details without damaging them?
Preparators used micro-computed tomography (micro-CT) to examine the fossil and guide their work through the surrounding stone. The Field Museum describes it as the first complete Archaeopteryx to be CT scanned with the data made available. Ultraviolet light also helped reveal fluorescent soft tissues, allowing preparators to recognize and preserve features such as scales on the undersides of the toes. Nature Field Museum
What did scientists find in the Chicago Archaeopteryx?
Feathers that may have helped shape the wing
The fossil preserves long feathers on the upper arm called tertials, which had not previously been seen in Archaeopteryx. The researchers say these feathers may have helped fill a gap between the wing feathers and the body created by the animal’s long upper arm. That makes the specimen relevant to questions about how early birds’ wings worked, but it does not establish that Archaeopteryx flew as efficiently or in the same way as living birds. Field Museum
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Skull and backbone features
The 2025 study reports a palate with features between those of troodontids and later Cretaceous birds, a vertebral column with paired proatlases, and a tail longer than previously recognized. These are anatomical observations that add detail to the fossil record; they do not, on their own, settle Archaeopteryx’s exact place in the evolution of birds. Nature
Traces in the hands and feet
Preserved soft tissues in the hands and feet support interpretations that Archaeopteryx spent time walking on the ground and may have climbed trees. Those are inferences from anatomy, not direct observations of how the animal behaved. Field Museum
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Could Archaeopteryx fly?
The Chicago fossil contributes evidence to the discussion of early flight, especially through its feathers and wing anatomy. The Field Museum describes Archaeopteryx as the earliest known dinosaur with evidence for feather-powered flight. The newly visible tertials may have helped close a gap between the wing and body, but a fossil cannot show the animal’s flight in action or establish its precise performance. Researchers therefore treat the anatomy as evidence relevant to flight mechanics, not proof that Archaeopteryx flew like a modern bird. Field Museum
What did the 2026 follow-up reveal about its mouth?
A follow-up paper in The Innovation, featured by the Field Museum on February 2, 2026, described oral papillae on the roof of the mouth, a small tongue bone, and openings near the beak tip interpreted as traces of nerves. The researchers suggest those openings could be an early analogue of the bill-tip organ found in modern birds. These features may inform ideas about feeding, but their function in the living animal cannot be observed directly from the fossil. Field Museum
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What the fossil can—and cannot—tell us
The specimen adds unusually clear anatomical evidence, but preserved structures and interpretations of their function are not the same thing. Its feathers, bones and soft tissues help researchers investigate flight, movement and feeding; they do not provide direct recordings of behavior, exact flight ability or diet. Nor does the fossil establish that Archaeopteryx was the direct ancestor of living birds. Its importance lies in what it preserves and the new questions those details allow scientists to examine.
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