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. (PHOTO / AFP)

ZURICH - The skeleton of a giant Tyrannosaurus Rex, a creature that roamed the Earth 67 million years ago, sold for 5.5 million Swiss francs ($6.13 million), less than expected, in Zurich on Tuesday.

A picture of 'Trinity' is seen during sale of the skeleton of the Tyrannosaurus-Rex (T-Rex) by Koller auction house in Zurich, on April 18, 2023. (PHOTO / AFP)

It was the first time in Europe and the third time worldwide that an entire T-Rex skeleton of exceptional quality was offered at auction, Koller, Switzerland's largest auction house, said in a statement

Measuring 3.9 metres (12.8 feet) high and 11.6 metres (38.1 feet) long, TRX-293 TRINITY is a composite skeleton of 293 bones from three different T-Rexs found between 2008 and 2023 in the U.S. states of Montana and Wyoming.

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An undisclosed buyer offered the winning bid of 4.8 million Swiss francs, less than the 5 million to 8 million Swiss francs estimate, but the total price was higher with the buyer's premium and fees at Koller Auctions. More than half of the skeleton's bones are original. The rest are replacements made from plaster and epoxy resin casts.

It was the first time in Europe and the third time worldwide that an entire T-Rex skeleton of exceptional quality was offered at auction, Koller, Switzerland's largest auction house, said in a statement.

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Two other T-Rex models discovered in North America, called Sue and Stan, were sold for $8.4 million and $31 million respectively in 1998 and 2020.