During a hike through the fossil-abundant landscapes of North Dakota, three young explorers uncovered a find hailed by researchers as one of the rarest in recent history — the partial skeleton of a teenage Tyrannosaurus rex. Dubbed Teen Rex, this exceptional specimen is providing scientists with valuable insights into the growth and development of this legendary predator. The discovery was highlighted in the PBS NOVA documentary T. Rex: The Ultimate Predator, broadcast in June 2024.
A Spark of Wonder Turns Into an Extraordinary Find
In the summer of 2022, brothers Liam and Jessin Fisher, along with their cousin Kaiden Amundson, explored the Hell Creek Formation, a famed site known for abundant late Cretaceous fossils. While wandering a rocky slope, they spotted what appeared to be a bone fragment jutting from the earth. Soon after, they found more bones, signaling a much larger discovery.
Their father, who volunteers with the Denver Museum of Nature & Science, quickly recognized the importance of the find. Paleontologist Dr. Tyler Lyson was contacted, and within weeks, a major excavation began. The team unearthed a nearly complete skeleton of a young T. rex, remarkably preserved for nearly 67 million years.
“To go out with the intent of finding a dinosaur fossil and your first one is a T. rex? That is, even being conservative, one in a million,” Lyson told to The New York Post.Add Cosmo Herald as a Preferred Source
Joining the Exclusive Group of Juvenile T. rex Finds
Fossils of adolescent Tyrannosaurus rex are extremely uncommon. Experts at the museum state that fewer than five such fossils have ever been recovered. Most reported finds come from either very young juveniles or fully mature adults, leaving a significant void in knowledge about the species’ developmental stages.
Analyzing bone morphology and size, researchers estimate that Teen Rex was approximately 13 to 15 years old when it died. Measuring close to 25 feet in length, it was notably smaller than adult T. rex specimens, which could grow up to 40 feet. This intermediate growth phase is not well understood, making this fossil crucial to studies of dinosaur ontogeny.
The bones might reveal details about the dinosaur's growth rate, the changes in its body proportions as it aged, and potentially shifts in its predatory behaviors throughout its life.
On Public Display for In-Depth Examination
Excavated in 2023, the fossil is now being carefully prepared at the Denver Museum of Nature & Science. It is part of an interactive public laboratory where visitors can observe paleontologists meticulously removing sediment from the ancient remains — a painstaking process expected to last several years.
This milestone discovery was spotlighted in the PBS Nova special T. Rex: The Ultimate Predator in June 2024, showcasing the journey from initial find through scientific exploration.
Insights Into the Growth of a Teenage T. rex
The significance of Teen Rex lies not only in how uncommon such fossils are, but also the clues it offers about the biology of T. rex. Many mysteries still exist, such as their growth patterns, social behavior at various ages, and how their ecological roles might have changed as they matured. As Dr. Lyson remarked:
” we want to understand how quickly a T. rex grew up from a little chick-sized animal into an 8,000-pound monster, we need juveniles. This is going to be an important fossil and help us determine the rate of growth for the T. rex and how its skeleton changed over time.”
This specimen may also shed light on the ongoing debate over whether Tyrannosaurus rex represents a single species or a genus encompassing multiple distinct lineages. With its intermediate characteristics, Teen Rex could provide fresh evidence toward resolving this question.
For Liam, Jessin, and Kaiden, this discovery has been nothing short of transformative. Their keen observation led to one of the decade’s most important paleontological breakthroughs.
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