A Tyrannosaurus rex skeleton discovered on a South Dakota ranch has sold for a record-breaking $50.1 million at Sotheby’s in New York, becoming the most expensive dinosaur fossil ever auctioned. The specimen, nicknamed Gus, was purchased by an unidentified bidder over the telephone after a spirited 10-minute bidding war that involved seven competing buyers.
The winning bid far exceeded the auction house’s presale estimate of $20 million to $30 million, which was itself the highest estimate ever placed on a fossil. Before the gavel came down, seven bidders competed for the prize in what marked a stunning moment in the rapidly expanding market for prehistoric specimens. The final price, including buyer’s fees, reached just over $50 million, shattering the previous fossil auction record of $44.6 million set in 2024 when billionaire Ken Griffin purchased a stegosaurus named Apex.
Gus is one of the largest and most complete T. rex skeletons ever recovered. Standing 12.5 feet tall and stretching 38 feet long, the specimen comprises 183 fossil bone elements and is approximately 61 percent complete by bone count, or between 75 and 80 percent complete by mass. The skull alone, measuring 54 inches long, is so heavy that it must be handled separately and displayed as a replica when the skeleton is mounted.
The fossil came from South Dakota’s Hell Creek Formation, a legendary geological boneyard that stretches across Montana, Wyoming, and the Dakotas. The skeleton is named after Gary “Gus” Licking, a cattle rancher who owned the 6,500-acre property where it was discovered. Licking had long suspected his land contained significant fossils and died in 2022, just one year into the excavation, before seeing the complete specimen.
Commercial paleontologist Thomas Heitkamp of Theropoda Expeditions led the excavation team that discovered the fossil in 2021. Heitkamp described a chance encounter that launched the search: he was passing by the ranch when he stopped to introduce himself to Licking at a watering trough. The excavation took three field seasons, from 2021 to 2023, followed by three additional years of laboratory work to clean and mount the bones. The team hand-dug roughly 7,000 square feet to recover all the material.
The specimen has several remarkable features. The skull contains about 82 percent of the original bones, and the skeleton includes rarely preserved components such as a wishbone, complete pelvis, and both feet. According to Sotheby’s, only one other T. rex is known to possess two well-represented feet. Gus also displays battle scars, including bite marks from other tyrannosaurs and evidence of fractured and healed bones in several ribs that the dinosaur survived during its lifetime, adding to its scientific significance.
Gus ranks among the most complete T. rex skeletons ever found, though less complete than some predecessors. Only 32 T. rex skeletons have been discovered since the first was found in 1902, and just two others have previously been more than 60 percent complete by bone count. Sue, the first dinosaur fossil ever sold at auction in 1997, is 90 percent complete and resides at the Chicago Field Museum. Stan, which sold for $31.8 million in 2020, is approximately 70 percent complete and is now displayed at the Natural History Museum in Abu Dhabi.
One aspect that boosted Gus’s appeal to collectors is that it comes with “full rights,” meaning it contains no bone casts from other dinosaur skeletons. Most mounted fossils require missing bones to be filled in using casts borrowed from other specimens, typically using Stan as the standard. The buyer could potentially commercialize Gus as a competing source for casts used by museums and private collectors.
The sale reflects an explosive boom in the dinosaur fossil market. Dinosaur remains have become one of the fastest-growing segments of the luxury collectibles market, with wealthy collectors seeking rare assets of long-term value while auction houses diversify beyond traditional art. Recent years have seen increasingly spectacular results, with a juvenile Ceratosaurus selling for $30.5 million last year against an estimate of just $4 million to $6 million, and a Triceratops called Trey fetching $5.55 million in March.
The auction has reignited longstanding concerns among paleontologists about the implications of private ownership of scientifically important specimens. Scientific journals will not publish research conducted on privately held fossils because there is no guarantee that future scientists will be able to verify findings. Paleontologists argue that once a fossil enters private hands, it is effectively lost to science, regardless of the specimen’s quality or historical significance.
The Society of Vertebrate Paleontology, an organization firmly opposed to fossil sales, has expressed particular concerns about Gus’s future accessibility. All eyes are now on the anonymous buyer, whose identity remains undisclosed, to determine whether the specimen will be permanently hidden from public view or made available for research and exhibition through loans or eventual donation to institutions.