Amassive T. rex known as Gus is expected to draw worldwide attention when its remarkably complete skeleton goes up for auction at Sotheby’s. The fossil carries the highest estimate ever assigned to a dinosaur specimen offered for sale.
The skeleton ranks among the largest and most complete T. rex discoveries on record. Measuring about 38 feet in length and standing 12.5 feet tall, it represents years of excavation and preparation work that transformed a promising fossil site into one of the most significant dinosaur finds to reach the auction market.
The story behind the dinosaur is closely tied to the late cattle rancher Gary “Gus” Licking, whose observations on his South Dakota property eventually led to the find. The excavation and preparation process spanned several years, involving extensive fieldwork and laboratory analysis before the skeleton was ready for public display and sale.
From Fossil Fragments To A Major Discovery
The discovery of Gus can be traced back to the late cattle rancher Gary “Gus” Licking, who owned the South Dakota property where the fossil was unearthed. For years, Licking found dinosaur teeth and small bone fragments on his land, leading him to suspect that more substantial remains might be buried beneath the surface.
As reported in the source material, Licking invited Thomas Heitkamp and his team from Theropoda Expeditions to investigate the site. He suggested they begin work in a 6,500-acre section of the ranch, a decision that ultimately led to the discovery of the T. rex in 2021.
The excavation revealed far more than isolated bones. Researchers soon realized they were dealing with a large and unusually complete specimen. The dinosaur was later named Gus in honor of Licking, who died one year after the excavation began and did not live to see the finished skeleton.
A Six-year Project From Excavation To Preparation
Recovering the fossil required patience and persistence. Sotheby’snotes that the excavation alone lasted three years, with researchers spending multiple field seasons carefully removing material from a complex fossil bed.
“This specimen took three years to excavate, with the team sometimes working for weeks straight without finding a thing. It really does feel like tackling the world’s hardest puzzle, except we have to find all the pieces first.” Heitkamp said in the press release.
He alsoexplained that the site preserved evidence of a broader Cretaceous ecosystem, including fossils from both plant and animal life.
“We documented each stage with quarry maps, inventories, and collection data. In the end, our diligence paid off and we were delighted to discover what turned out to be a huge and incredibly complete T. rex specimen,” he added.
The effort did not end when the bones left the field. Information provided by the excavation team indicates that another three years were devoted to laboratory preparation. During that time, technicians removed surrounding rock, cleaned the fossils, prepared individual bones, and identified skeletal elements before assembly. Taken together, the excavation and preparation phases stretched across six years.
An Unusually Complete T. Rex Heads To Sotheby’s
One of the defining features of Gus is its completeness. The skeleton includes 183 fossil bones, representing approximately 82 % of the dinosaur’s known skeletal structure. Details released alongside the auction announcement highlight the presence of several major anatomical elements, including a well-preserved skull, a furcula, or wishbone, and a completely represented pelvis.
The dimensions of the specimen are equally striking. The body measures roughly 38 feet long, while the skull alone extends more than four feet. Standing about 12.5 feet tall, Gus ranks among the largest T. rex specimens ever discovered.
These characteristics help explain the extraordinary valuation assigned by Sotheby’s. The auction house estimates the fossil could sell for between $20 million and $30 million, a range described in the source as the highest estimate ever placed on a dinosaur offered at auction.
