T. Rex Teeth and Bones: What Collectors Can (and Can't) Legally Own

Tyrannosaurus rex is one of the rarest animals in the entire fossil record, with only around 50 partial to substantial skeletons ever discovered, and it is also one of the very few dinosaurs that private collectors can legitimately own real material from. Those two facts sit together because of a legal landscape that is more specific and more interesting than most people realize.

The Rule Almost Everyone Gets Wrong: It Depends on Whose Land It Was Found On

In the United States, whether a fossil can be legally collected, kept, or sold comes down almost entirely to one question: was it found on federal land or private land? Under the Paleontological Resources Preservation Act of 2009, vertebrate fossils on federal land, managed by agencies like the Bureau of Land Management or the National Park Service, can only be collected under a permit issued to qualified researchers for scientific or educational purposes. They remain public property, are curated in approved repositories, and cannot legally be sold. Casual collecting without a permit is allowed on some federal land, but only for common invertebrate and plant fossils, never vertebrate material like dinosaur bone or teeth.

Private land works completely differently. A fossil found on privately owned land belongs to the landowner, full stop. That landowner can keep it, donate it to a museum, or sell it commercially, and this is precisely why virtually every T. rex specimen and tooth available to collectors traces back to private ranch land in the Hell Creek Formation, spanning parts of Montana, North and South Dakota, and Wyoming. Nearly every documented T. rex skeleton, including the two most famous ones, was recovered from private property.

A Real Case Study: Why “Private Land” Isn't Always a Simple Answer

The most famous T. rex skeleton in the world, nicknamed Sue, shows exactly how complicated that private land question can get. Sue was discovered in August 1990 by Sue Hendrickson on a South Dakota ranch owned by Maurice Williams, a member of the Cheyenne River Sioux Tribe. The Black Hills Institute, the commercial fossil company Hendrickson was working for, paid Williams $5,000 for the rights to excavate and spent seventeen days recovering what turned out to be roughly 90 percent of the skeleton by bulk, still the most complete T. rex ever found.

The complication was that Williams held his land in trust through the U.S. Department of the Interior as a member of the tribe, rather than owning it outright the way a typical private landowner would. In 1992, the FBI and National Guard seized the fossil, arguing that trust land status meant Williams could not have sold it without federal approval. What followed was years of litigation involving the Institute, Williams, the Cheyenne River Sioux Tribe, and the federal government, plus a separate and largely unrelated federal prosecution of the Institute's president, Peter Larson, on customs charges. In 1997, once the courts confirmed Williams as the legal owner, Sue was auctioned by Sotheby's for $8.36 million, at the time the highest price ever paid for a fossil, and went to Chicago's Field Museum, where it remains on permanent display. Williams received the bulk of the proceeds; the Black Hills Institute, despite discovering and excavating the fossil, received nothing.

The lesson for today's collectors is not that every private-land fossil is legally risky. It is that “private land” can mean several different things depending on trust status, mineral rights, and who actually holds legal title, and that documented, verifiable landowner permission at the time of excavation is the single most important piece of paperwork a specimen can have.

Complete Skeletons vs. Isolated Teeth: Two Very Different Markets

It is worth being clear about scale here. With only around 50 partial T. rex skeletons known to exist worldwide, a mounted or museum-grade skeleton is not something an ordinary collector will ever purchase. When one does reach the open market, prices reflect that scarcity: Sue sold for $8.36 million in 1997, and a second well-known specimen, nicknamed Stan, sold for $31.8 million at Christie's in 2020, at the time the highest price ever paid for any fossil.

Isolated T. rex teeth are a completely different story, and this is where legal, realistic collecting actually happens. Like modern sharks, T. rex continuously shed and replaced teeth throughout its life, so individual teeth, some of which reached up to a foot in length, including the root, are recovered far more often than associated skeletal material and are legally sold when they come from documented private land. An isolated tooth with solid provenance is genuinely one of the only ways an individual collector can own real T. rex material rather than a museum-grade skeleton locked behind a price tag with seven or eight figures.

What This Means for You as a Collector

A few practical takeaways from all of this:

Ask where it was found, specifically: A seller who can name the formation (Hell Creek, for example) and confirm private-land origin is giving you exactly the information that determined the outcome of the Sue case.

Understand that documentation is not optional: Given how contested T. rex ownership has been historically, provenance paperwork matters more for this species than for almost any other dinosaur.

Know which market you are actually in: A tooth and a skeleton are not scaled versions of the same purchase. One is a realistic, legal collector's item; the other is a multi-million-dollar, museum-scale transaction that happens only a handful of times per decade.

Interested in dinosaur material with documented origin and clear authenticity information? Browse our Dinosaur Fossils collection to see what is currently available.

Wrapping Up

T. rex sits at an unusual intersection: scientifically priceless, legally restricted on public land, and yet still genuinely collectible thanks to America's private land laws and a shed tooth or two making its way to market with the right paperwork. Understanding the difference between federal and private land, and knowing that even private land can carry legal complications like the ones that defined the Sue case, is exactly the kind of knowledge that separates a confident collector from someone who got lucky.

Written by: Brandon Zulli, owner of Fossil Driven