Sotheby’s opens live bidding on a rare Tyrannosaurus rex fossil nicknamed Gus on July 14, with the skeleton expected to bring up to $30 million. The 67-million-year-old specimen is billed as one of the largest and most complete T. rexes ever found.
The fossil was discovered on a ranch in South Dakota and is represented as 183 fossil bone elements, or about 61% complete by bone count. The remains have been mounted in a custom steel armature with replicas of the missing bones, and the reconstruction is posed as if in hot pursuit with its mouth full of dagger teeth.
Thomas Holtz on Gus
Thomas Holtz, a tyrannosaur specialist at the University of Maryland, said, “It does seem to be a spectacular specimen” and called it “scientifically significant.” His assessment points to the part of the market that cannot be priced at auction: the data a skeleton can still deliver if it stays available for study.
That is the friction in this sale. Auction houses say fossil sales help science by rescuing fossils from erosion and by helping to get them expertly excavated, prepared, and assessed. Paleontologists counter that private buyers can remove rare specimens from science once the hammer falls.
Sue in Chicago
Cassandra Hatton, vice chairman and head of the science and natural history department at Sotheby’s, said court cases around Sue clarified that in the US, whoever owns the land also owns whatever fossils are on it. She added, “Before Sue was sold, there were no laws about who owned fossils. There was no value truly ascribed to them.”
Sotheby’s auctioned Sue in 1997 for roughly $8.4 million, and Sue went to the Field Museum in Chicago. In 2024, Sotheby’s sold Apex to Ken Griffin for $44.6 million, and last year it sold the only known juvenile Ceratosaurus in the world to an anonymous buyer for $30.5 million. A 2025 study found more T. rex fossils in private collections than in public trusts.
July 14 bidding
Hatton said, “If a fossil is not excavated, it’s lost to everyone.” That is the wager behind this sale: whether Gus becomes a specimen that remains part of the scientific record or another fossil carried out of it by a private buyer.
The price will answer one part of the question, and the buyer will answer the other. Whoever wins Gus on July 14 will set the specimen’s next chapter at a time when museums cannot compete at auction as prices keep climbing.
