It was excavated on private land in Moffat County, Colorado, near the town of Dinosaur, between 2022 and 2023. "Apex" sold for $45 million at a Sotheby's auction Wednesday. Alexi Rosenfeld / Getty ...

The 150-million-year-old specimen is valued at up to $6 million by Sotheby’s. Some paleontologists worry this auction and earlier ones are driving fossil market speculators.