Apex lived during the late Jurassic Period, between 161 million and 146 million years ago. 

Shutterstock.com (background); Lev Radin/Sipa USA via AP Images (Stegosaurus)

Rebuilding a Dinosaur

While walking near his home in May 2022, Jason Cooper noticed a large bone sticking out of a rock. It turned out to belong to the largest, and one of the most complete, stegosaurus skeletons ever. 

In July, that skeleton sold for $44.6 million—making it the world’s most expensive fossil. 

Cooper makes his living as a fossil hunter. He found the stegosaurus remains on his property in northwestern Colorado. The region is the richest source of dinosaur fossils in the United States.

After the discovery, Cooper began a nearly two-year process to prepare the skeleton, which he named Apex, for display. First, he and his team excavated, or dug up, the bones. The dinosaur’s remains were buried in hard sandstone. The team carefully removed layers of rock from the 254 hardened bones they found. It’s estimated that Apex once had 319 bones. The missing bones were 3-D printed or sculpted. 

Then Cooper’s team rebuilt the skeleton like a giant puzzle. Once they had it just right, they took Apex apart and shipped the pieces to Sotheby’s, an auction house in New York City. They rebuilt Apex in Sotheby’s gallery.

Cooper understands why the buyer who won the auction was so interested in purchasing Apex.

“I can feel their excitement because it’s the excitement I had,” he says in a video made for Sotheby’s. “Then they’re hopefully going to transfer that on to somebody else, like a museum.”

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