A dinosaur that looks like a miniature T. rex is now one of the world’s most expensive fossils. The rare skeleton of a Nanotyrannus sold for $47.3 million to a mystery buyer at auction in New York City. Sotheby’s auction house had expected it to fetch anywhere from $6 to $9 million. The price tag for “Jodi,” as the skeleton is nicknamed, makes it the second-priciest set of dinosaur bones ever sold. This summer, a T. rex fossil known as “Gus” sold for a record $50.1 million. Some scientists have opposed such private sales, saying they should go to museums or other institutions for study and public display.