A rare T. rex fossil expected to sell for $30 million (£22 million) or more at Sotheby's this week rattled scientists who argue dinosaur fossils should not end up in private collections, but in museums.
The specimen, known as Gus, is one of the most complete Tyrannosaurus rex skeletons ever discovered, and researchers fear another record-breaking sale could make priceless prehistoric finds even harder for scientists and the public to access.
