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The clearest direct evidence comes from a five- to seven-year-old Gorgosaurus libratus from Alberta. Its abdominal cavity preserves the partly digested remains of two small caenagnathid theropods, identified in the Natural History Museum’s account as young Citipes. That meal shows that at least one growing tyrannosaurid could target small dinosaurs. It does not establish a universal menu for every juvenile tyrannosaur.
Other evidence shows the story was not a simple switch from “small prey” to “large prey” at one birthday. Feeding traces attributed to late-stage juvenile or subadult Tyrannosaurus rex occur on a hadrosaur tail vertebra, indicating that some older juveniles already used large-bodied food. The most defensible picture is a flexible, age-related expansion of prey options as tyrannosaurs grew larger and their skulls and teeth changed.
The direct fossil evidence: a juvenile Gorgosaurus meal
A stomach preserved in place
A 2023 Science Advances study describes an articulated juvenile Gorgosaurus libratus from Alberta’s Upper Cretaceous Dinosaur Park Formation. The fossil is dated to approximately 75.3 million years ago. Inside the abdominal cavity are remains of two small caenagnathid theropods. The Natural History Museum’s account identifies those prey animals as Citipes and estimates that the predator was five to seven years old.
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The bones are not merely found near the skeleton. They are positioned in the body region where gut contents would be expected, and some elements show digestion. François Therrien, curator of Dinosaur Palaeoecology at the Royal Tyrrell Museum and lead author of the study, described it as “the first occurrence of stomach contents preserved in place in a tyrannosaur.” That makes this specimen unusually direct evidence: it records what one young tyrannosaur had eaten shortly before it died.
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Why the meal appears selective
The preserved prey material is dominated by leg elements rather than complete carcasses. Therrien interpreted that pattern as possible selective feeding: “They selectively dissected away the legs to target their muscle-rich flesh and left the rest of the carcass behind.” Digestion and the missing portions are consistent with that interpretation, but the behavior remains an inference from a single individual. One fossil cannot show that all young Gorgosaurus routinely chose legs or that selective dismemberment was standard practice.
What this specimen establishes
- A young tyrannosaurid definitely consumed small theropod prey.
- The prey included at least two individuals in one feeding event or feeding episode.
- The food was partly digested before the predator’s death and burial.
- The evidence comes from Gorgosaurus in Alberta, not directly from juvenile T. rex.
Those boundaries matter. A preserved meal is stronger evidence for an individual’s diet than a generalized reconstruction based on teeth, but it represents one animal, one place and one moment in time.
How growth changed a tyrannosaur’s feeding options
Small bodies and narrow prey opportunities
Young tyrannosaurs were much smaller than the adults of their species. Their skulls, jaws and teeth were also proportionally different. A juvenile had less reach and bite force, making very large, heavily defended herbivores difficult or dangerous targets. Small dinosaurs and other relatively manageable animals could be subdued, carried or processed with less risk.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The Alberta stomach contents fit that mechanical reality. Small caenagnathids were within the size range a growing tyrannosaur could handle, and their legs offered concentrated muscle. The fossil therefore links body size and prey size in a concrete case rather than relying only on an anatomical model.
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Adult anatomy opened a different niche
As tyrannosaurs matured, their skulls became deeper and more robust, while their teeth became better suited to imposing high loads on flesh and bone. Fully grown tyrannosaurids could exploit large herbivorous dinosaurs that were unavailable, or impractical, to smaller individuals. This difference would reduce direct competition between age classes living in the same ecosystem: juveniles could focus on smaller animals while adults handled much larger carcasses or living prey.
This is an ecological interpretation, not a claim that juveniles and adults ate completely separate foods. A growing animal could add larger prey as its abilities improved, and it could still take small prey when that was easier or safer.
What late juvenile T. rex evidence adds
Feeding traces on a hadrosaur vertebra
A 2019 PeerJ study documented feeding marks attributed to a late-stage juvenile T. rex on a hadrosaurid caudal, or tail, vertebra. The marks are evidence of a feeding interaction with a large-bodied herbivore before the tyrannosaur reached its massive adult form.
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Why this complicates a simple menu
The Gorgosaurus meal and the hadrosaur trace represent different kinds of evidence and different growth stages:
| Evidence | Predator and stage | Food evidence | What it can show |
|---|---|---|---|
| Abdominal contents | Five- to seven-year-old Gorgosaurus libratus | Two small caenagnathid theropods, identified as Citipes | Direct consumption by one individual |
| Feeding traces | Late-stage juvenile or subadult T. rex | Marks on a hadrosaurid tail vertebra | Use of a large-bodied food source, subject to attribution and behavioral interpretation |
Together they support a broad shift in feeding opportunities during growth, but they do not define a single sequence that every tyrannosaur followed. A juvenile could eat small prey and, later, interact with large carcasses or living herbivores before adulthood.
What young tyrannosaurs may have eaten before the fossil record catches them
Likely foods are not the same as proven foods
The cited fossils do not reveal a complete hatchling menu. The American Museum of Natural History has presented insects and small lizards as plausible foods for juvenile T. rex, drawing on comparisons with early tyrannosaurs and living animals. That is a reasoned inference from anatomy and ecology, not a stomach fossil showing a hatchling eating an insect or lizard.
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Why insects cannot be treated as a universal answer
Early tyrannosaurs varied in size, habitat and anatomy, and the fossil record is uneven. Some young animals may have taken insects, lizards, small mammals or small dinosaurs, depending on what lived nearby. The available evidence does not establish that every hatchling began on insects, nor does it provide a universal age at which a tyrannosaur moved from one prey category to another.
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Stomach contents
Prey bones inside an articulated body cavity are the most direct evidence of an animal’s last meals. Researchers still assess whether the bones are genuinely gut contents, whether they were moved after death and how digestion altered them. The Gorgosaurus specimen is especially persuasive because the prey remains occur in the abdominal region and show digestion.
Tooth marks and breakage
Feeding traces on another animal’s bones can reveal contact with a carcass or prey. Scientists examine mark shape, spacing, orientation and bone damage, then compare those features with known tyrannosaur teeth and other possible producers. Attribution to juvenile T. rex is therefore a conclusion supported by several observations, not a direct view of the act itself.
Functional anatomy
Skull depth, tooth form, jaw leverage and body size help estimate what an animal could physically process. Anatomy can indicate that juveniles were better suited to slicing and adults to high-force bites, but it cannot by itself prove what an individual chose to eat. Dietary claims are strongest when anatomical predictions match trace fossils or preserved gut contents.
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What the evidence does—and does not—say about a growth trajectory
- Supported: at least one young tyrannosaurid ate small dinosaur prey.
- Supported: late juvenile or subadult T. rex could use large-bodied food sources.
- Supported as an interpretation: changing body size and skull mechanics created an age-related expansion or shift in prey options.
- Not established: a precise prey-transition age shared by all tyrannosaurs.
- Not established: a complete diet for hatchlings.
- Not established: that every juvenile T. rex followed the Gorgosaurus pattern.
Growth stage and taxonomy must also be kept separate. A five- to seven-year-old Gorgosaurus is not automatically equivalent to a juvenile T. rex, and small tyrannosaur fossils cannot all be assigned to young T. rex without careful identification.
Why more fossils are needed
Stomach contents are exceptionally rare because digestive remains are easily scattered, dissolved or destroyed before burial. Feeding traces are more common but usually lack a visible record of the feeder’s age, sex or exact behavior. The result is a patchwork: one unusually informative meal, a separate trace fossil, and anatomical comparisons that fill some gaps without eliminating uncertainty.
Additional abdominal-content specimens from different tyrannosaur species, ages and environments could reveal whether small theropods were a recurring choice or an opportunistic meal. More trace fossils could show how often late juveniles attacked or scavenged large herbivores. Until those discoveries are made, claims about a universal juvenile menu or a fixed switch point go beyond the evidence.
The evidence-based answer
Young tyrannosaurs did not follow one known, species-wide menu. The strongest direct case shows a five- to seven-year-old Gorgosaurus eating two small Citipes-like caenagnathids, probably selecting their meaty legs. As tyrannosaurs grew, stronger jaws and larger bodies made larger carcasses and herbivores accessible; feeding traces show that this access could begin before adulthood in at least some T. rex. Insects, lizards and other small animals remain plausible foods for the youngest individuals, but those items are inferred rather than directly preserved as hatchling meals.
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