A giant Tyrannosaurus Rex skeleton, which lived millions of years ago, was unveiled to the public in Switzerland Wednesday before being put up for auction next month.

The giant carnivore, named TRX-293 Trinity, is expected to fetch between 5 million ($5.43 million) and 8 million Swiss francs ($8.70 million) when it goes on sale in Zurich on April 18.

Standing 3.9 meters high and measuring 11.6 meters long, it is only the third T-Rex skeleton to be offered at auction, and the first in Europe.

"The name of this skeleton is ‘Trinity’ because it's built out of three individuals and all were found in the U.S.," said Cyril Koller, owner of the auction house conducting the sale.

The rest of the name derives from the 293 bones in its skeleton.

Koller thought a private individual would be the likely buyer, although he was sure the public would still get to see it in the future.

Discoveries of T-Rex fossils are extremely rare, said Hans Jacob-Siber, a paleontologist at the Aathal Dinosaur Museum in Switzerland.

"It’s not a cast or a copy, it’s the original. And there are very few, very few," Siber told Reuters. "In fact, until about 1970 or 1980, there used to be less than a dozen Tyrannosaurus, most of them were already in United States' museums."

Most of the other fossilized T-Rexes are housed in museums, meaning massive interest whenever a skeleton comes up for sale.

Two other T-Rexes discovered in North America – called Sue and Stan – fetched $8.4 million and $31.8 million respectively when they were sold in 1997 and 2020.