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Banner image: In early 2020, a team听collected a detailed 3D scan of a Triceratops skull on the CU Boulder campus. (Credit: Glenn Asakawa/CU Boulder)

Next month, CU Boulder will say goodbye to a beloved member of the campus community鈥攖his one has three horns, a wide frill like a fan and was dug up from the ground in Wyoming in 1891.

That resident is, of course, the fossil skull of a Triceratops dinosaur that has sat on display at the CU Museum of Natural History for decades. On May 9, a team from the Smithsonian Institution, which loaned the skull to CU Boulder in 1981, will begin the painstaking process of disassembling the Triceratops鈥攊n preparation for shipping it back to the National Mall.

鈥淚t鈥檚 going to a good place: home,鈥� said Jaelyn Eberle, curator of fossil vertebrates for the CU Museum.听

Visitors who want to say one last farewell can visit the Triceratops for free at the museum until May 8.

The skull is an important part of the history of the American West, Eberle said. It was part of an epoch of paleontology called the 鈥淏one Wars鈥� and also connects baby直播app to its past 66 million years ago鈥攚hen Tyrannosaurus rex stalked the landscape, and herbivores like Triceratops munched on palm fronds and other prehistoric plants.听

While regular museum visitors may miss seeing the Smart car-sized specimen, Eberle said that the move is a positive one: At the Smithsonian, scientists from around the world will be able to study the skull in greater-than-ever detail, potentially even answering some big mysteries about Triceratops. Scientists, for example, are still debating how Triceratops used their horns and frill.Museum staff haven鈥檛 yet decided what will take the place of the Triceratops when it departs in May.

鈥淛ust the other day I saw a little kid, probably in preschool, walk up to that dinosaur and her mouth just fell open,鈥� Eberle said. 鈥淓ven though we鈥檝e had it since the 1980s, I don鈥檛 think it has ceased to excite people. At the same time, now we have the chance to share something new with visitors, and I think that鈥檚 equally exciting.鈥�

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Kenneth Carpenter was an undergraduate student in the early 1980s when he helped to drive the specimen to baby直播app in a flat-bed truck. Most of the skull came assembled, but Carpenter put together pieces of the frill in the museum鈥檚 Paleontology Hall using a steel bar, mesh and plaster of Paris.

鈥淚 was doing all this work as a work-study student,鈥� said Carpenter who acknowledged that the effort distracted him from his classes.听

Carpenter, who earned his doctorate in geological sciences from CU Boulder in 1996, added that听Triceratops fossils were a听player in one of the most famous epochs in the history of paleontology.听

In the late 1800s, scientists Othniel Marsh and Edward Cope were in the middle of a long-running feud鈥攚ith each man racing to name as many new fossil animal species as he could, and bash his rival in the press. Marsh himself inspected the 1891 skull from Wyoming. He decided it belonged to a brand-new species, which he named Triceratops calicornis.听

In this case, Marsh鈥檚 eagerness to name new species may have gotten the better of him. Scientists no longer recognize Triceratops calicornis as its own species, but instead lump it in with Triceratops horridus, which Marsh had also named years earlier.

Despite the skull鈥檚 back-and-forth history, the fossil remains what paleontologists call a 鈥渉olotype鈥濃�攐r a scientific specimen that defines an entire species.

鈥淚t鈥檚 the gold standard for a species,鈥� Carpenter said.

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The fact that it鈥檚 a holotype is why CU Boulder鈥檚 own Triceratops is heading back to Washington D.C.鈥攎useums rarely lend out holotype specimens for long periods anymore.

Eberle, who joined CU Boulder in 2002, is sad to see it go. She has fond memories of bringing her oldest son, now 22, to the Paleo Hall when he was a child.听

鈥淗e grew up in the museum,鈥� she said.

But there are plenty of other ancient wonders in the museum. Currently, the CU Museum holds nearly 5 million specimens in its collections, including more than 100,000 vertebrate fossils鈥攆rom giant marine predatory reptiles called mosasaurs to ancient ungulates that evolved after the extinction of the dinosaurs.

One of her own favorites is the skull of a Megacerops, which sits on display next to the Triceratops. These extinct relatives of today鈥檚 rhinoceroses grew to the size of elephants and traveled in herds across baby直播app and other western states roughly 34 to 38 million years ago.听

鈥淲e have plenty of possibilities that would also help to show the public what lived in baby直播app and the Rocky Mountain region millions of years ago,鈥� Eberle said.

Patrick Kociolek, director of the CU Museum of Natural History, is excited for the possibilities.

鈥淣early one million visitors have seen that Triceratops in the Henderson building. That deep knowledge and research excellence is still present at the museum today,鈥� he said. 鈥淒riven by our mission to share extraordinary objects and specimens, and the knowledge gained about them in scientific research and study, we continue to present the natural world, for free, at the听museum, as well as virtually.鈥�