Sotheby’s Prepares $30 Million Auction of “Gus,” One of the Largest T. rex Skeletons

On July 14, Sotheby’s will open live bidding for a 67-million-year-old Tyrannosaurus rex skeleton nicknamed “Gus.” The specimen, uncovered on a South Dakota ranch, comprises 183 fossil bone elements and is about 61 % complete by bone count. Sotheby’s describes the reconstructed skeleton as poised in a predatory stance, with missing bones replaced by replicas mounted on a custom steel armature. The house expects the lot to fetch up to $30 million, with the winning bidder potentially a public museum or a private collector.

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The sale follows a trend that began in 1997 when Sotheby’s auctioned “Sue,” the most complete T. rex on record, for roughly $8.4 million. At that time, U.S. law did not clearly define fossil ownership; the prevailing rule was that landowners possessed any fossils found on their property. Cassandra Hatton, vice chairman of Sotheby’s science and natural history department, notes that court decisions after the Sue sale clarified this ownership model, spurring a booming market for privately sold fossils. In many other nations, state ownership of fossils remains the norm.

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Paleontologists regard Gus as “scientifically significant” because of its size, completeness, and high-quality bone preservation. Thomas Holtz, a tyrannosaur specialist at the University of Maryland, calls the specimen “spectacular,” emphasizing its value for research into late-Cretaceous theropods.

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Scientists warn that when private collectors acquire fossils as luxury assets, the specimens are effectively removed from scientific study. The loss of access hampers research on dinosaur biology, ecology, and evolution, and limits public education opportunities that museum displays provide.

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• “It does seem to be a spectacular specimen,” — Thomas Holtz, tyrannosaur specialist, University of Maryland

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• “Before Sue was sold, there were no laws about who owned fossils. There was no value truly ascribed to them,” — Cassandra Hatton, Vice Chairman, Science and Natural History, Sotheby’s

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• “scientifically significant,” — Thomas Holtz, University of Maryland

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• “an incredible 183 fossil bone elements” making it “approximately 61 % complete by bone count.” — Sotheby’s auction description

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