A Tyrannosaurus rex skeleton nicknamed “Gus” sold on Tuesday for US$50.1 million at Sotheby’s in New York, making it the most valuable dinosaur fossil bought at auction, after a 10-minute battle between seven bidders. “Gus” is one of the world’s most complete T. rex skeletons – with 183 fossilised bones – and was discovered on a cattle ranch in South Dakota in 2021. The giant beast lived some 72 to 66 million years ago – a period characterised by a warm climate, high sea levels and vast...