A composite Tyrannosaurus rex skeleton called Trinity sells for 5.5 million Swiss francs ($6.1 million) in a rare auction in Zurich. The skeleton fetched a hammer price of 4.8 million Swiss francs, rising to 5.5 million with the buyer's premium added on. "It's the third T-Rex sold on auction, the first T-Rex sold in Europe on auction," says auctioneer Cyril Koller. Trinity is made up of bones from three dinosaurs -- excavated between 2008 and 2013 from the Hell Creek and Lance Creek formations in Montana and Wyoming. IMAGES AND SOUNDBITES