Koller auction house director Cyril Koller (C) gestures next to the skull of the 'Trinity' during sale of the skeleton of the Tyrannosaurus-Rex (T-Rex) by Koller auction house in Zurich, on April 18, 2023. - The T-Rex's skeleton, dating back 67 million years and made up of bones from three dinosaurs excavated between 2008 and 2013 from the Hell Creek and Lance Creek formations in Montana and Wyoming, was sold for 4,8 million Swiss francs ($5,333333 million). (Photo by Fabrice COFFRINI / AFP)