A skeleton called Spike has sold for £3.46m.
The bones of the Oviraptorosaur were found and excavated on private land.
It lived around 68-66 million years ago.
About 100 fossil bones were mounted on a frame.
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They include its jaws, hands, pelvis, and feet.
They were found in Perkins, South Dakota, US.
It was sold by Christie’s in central London last Thursday (11 Dec).
A Christie’s spokesman said: “Spike is arguably the most complete caenagnathid known in private hands and marks the debut of the iconic oviraptorosaurs at auction.
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“Like modern-day birds, Caenagnathids also had pointed beaks and were covered in feathers.
“Crowning their heads was a large, bony protrusion, giving this particular Caenagnathid specimen its name: Spike.”
A lot description said: “From the Hell Creek Formation, Perkins County, Maastrichtian, Late Cretaceous, circa 68-66 million years ago.
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“A remarkably preserved specimen of a Caenagnathid oviraptorosaur with representation of all four key skeletal regions, jaws, hands, pelvis, and feet.
“Approximately 100 fossil bone elements with additional cast, sculpted and 3D printed material, mounted on a custom frame.”
It added: “Found and excavated on private land in South Dakota, Perkins County, during the 2022 field season.
“With all legal rights secured, ensuring undisputed ownership and transferability.
“Prepared and mounted in Europe during 2024 and 2025.
“Acquired by the current owner in 2024.”
