T. rex fossil could become most expensive dinosaur ever sold - BBC News

A 67 million-year-old Tyrannosaurus rex will go on sale in New York with a pre-sale value of $30m.

T. rex could become most expensive fossil ever - but it's a ​problem for scientists

Image source, Matthew ShermanByEsme StallardSenior climate and science reporterIn 1997, Sotheby's hosted a natural history auction selling wonders of our prehistoric world - but for the first time a dinosaur was on the books.

It was a niche event mostly attended by the world's museums looking for specimens to add to their collections.

The dinosaur in question was a Tyrannosaurus Rex called Sue - she was eventually sold for $8m (£6m) to the Field Museum in Chicago.

Nearly 30 years later, on Tuesday, another T. rex will make an appearance at the annual auction - one of the most complete specimens of this kind ever found.