A 3.9-meter-long Tyrannosaurus-Rex dinosaur skeleton named “Trinity” is set to be auctioned in Zurich, Switzerland on April 18, with an estimated selling price between 5 and 8 million Swiss francs. The skeleton consists of bones from three different dinosaurs and is currently on public display at the Tonhalle Zürich Concert Hall. The 67-million-year-old bones were excavated in Montana and Wyoming and the auction house owner, Cyril Koller, named it Trinity as it’s made up of three dinosaurs.