Christie’s is auctioning the skeletons of an adult and a juvenile Allosaurus, sold as a pair, with an estimated price of between £5–8 million, as well as a Stegosaurus fossil, valued between £3–5 million.

All three dinosaurs, displayed at Christie’s exhibition space in London ahead of the auction titled “Jurassic Icons: Allosaurus & Stegosaurus”, were discovered during an excavation in the U.S. state of Wyoming.

Three iconic dinosaurs of the Jurassic period, unearthed in Wyoming and coming to Christie’s in London. We talk to one of the palaeontologists whose excavations uncovered a mighty Stegosaurus along with two examples of Allosaurus. Explore more here: https://t.co/xKNH3KXCgI pic.twitter.com/j5Apmi1m5B

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“It’s a rare event to see a dinosaur skeleton go up for auction,” James Hyslop, Head of Science and Natural History at Christie’s London, told Reuters.

“The logistics behind setting up something like this—and in this case, three dinosaurs—are incredibly complex,” he added.

In July, a Stegosaurus fossil discovered in Colorado sold for a record-breaking $44.6 million during an auction at Sotheby’s.