The skeleton of a gigantic Triceratops over 66 million years old, named "Big John", is seen on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. A private, anonymous U.S. collector bought the fossilized remains of "Big John," the largest triceratops dinosaur ever discovered by paleontologists, for 6.65 million euros ($7.74 million) at a Paris auction. REUTERS/Sarah Meyssonnier

Visitors take a picture of the skeleton of a gigantic Triceratops over 66 million years old, named "Big John", on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. Big John - named after the owner of the land where the dinosaur's bones were found - roamed modern-day South Dakota more than 66 million years ago. REUTERS/Sarah Meyssonnier

The skeleton of a gigantic Triceratops over 66 million years old, named "Big John", is seen on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. The first piece of bone from the supersized skeleton - the skull alone is 2.62 meters long and 2 meters wide - was found in 2014. REUTERS/Sarah Meyssonnier

Visitors look at the skeleton of a gigantic Triceratops over 66 million years old, named "Big John", on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. By 2015, paleontologists had unearthed 60% of the skeleton, a rare feat, made of over 200 pieces which were painstakingly put together in Italy, to prepare for the Paris auction. REUTERS/Sarah Meyssonnier

The skeleton of a gigantic Triceratops over 66 million years old, named "Big John", is seen on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. Picture taken with a slow shutter speed. REUTERS/Sarah Meyssonnier

Visitors look at the skeleton of a gigantic Triceratops over 66 million years old, named "Big John", on display before its auction by Binoche et Giquello at Drouot auction house in Paris, France, October 20, 2021. Picture taken with a slow shutter speed. REUTERS/Sarah Meyssonnier