A rare baby allosaurus dinosaur fossil, which stands just over 5ft tall, and 11ft long, is to be auctioned at Christie’s alongside a slightly taller adult that could be its mother.

The specimen was unearthed in 2021 on private land within the Morrison Formation, swiftly offered for sale by a fossil dealer, and purchased for the museum with funds from philanthropists David ...

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.

Sotheby’s has a record of historic fossil sales. In 1997, it sold Sue, a T-rex, the first dinosaur to come to auction, to Chicago’s Field Museum for what the New York Times called the ...