The skeletons - two Allosaurus and one Stegosaurus - date back approximately 150 million years.

Those visiting Christie’s in London this week have been treated to an unusual spectacle. For the first time since it moved to its King Street address in 1824, the auction house’s gallery is not showcasing paintings or sculptures but dinosaurs: three prehistoric skeletons that it estimates are worth up to £13mn.

Three dinosaur fossils from the Jurassic period will go under the hammer at a London auction on Thursday, with price estimates of millions of dollars. Christie's is offering the skeletons of an adult and juvenile Allosaurus,