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The best direct evidence comes from a juvenile Gorgosaurus libratus that died with the remains of two small theropods in its abdominal cavity. The prey, identified in a museum account as young Citipes, had partly digested bones, showing that this five- to seven-year-old tyrannosaur had recently eaten small, agile dinosaurs.
That fossil supports a broad pattern rather than a fixed menu: smaller tyrannosaurids could take small prey, while growing animals increasingly had access to larger carcasses. Feeding marks attributed to late-stage juvenile Tyrannosaurus rex show that some older juveniles or subadults were already using large-bodied prey. No fossil yet establishes one universal diet or a precise age when every tyrannosaur switched from small animals to giant herbivores.
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The clearest meal fossil: a young Gorgosaurus
A 2023 report in Science Advances described an articulated juvenile Gorgosaurus libratus from Alberta’s Dinosaur Park Formation. The rock layer dates to approximately 75.3 million years ago. Inside the abdominal region were remains of two small caenagnathid theropods.
The Natural History Museum’s account of the specimen estimates that the Gorgosaurus was five to seven years old. It identifies the prey as young Citipes and reports that the preserved leg bones show digestion. This is unusually direct evidence: the bones were inside the predator’s body, rather than merely found near a tyrannosaur tooth or associated with a possible kill.
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François Therrien, curator of Dinosaur Palaeoecology at the Royal Tyrrell Museum and lead author of the study, called it “the first occurrence of stomach contents preserved in place in a tyrannosaur.” The abdominal position matters because it provides a physical link between predator and prey that trace fossils and isolated bones cannot provide by themselves.
What the preserved bones suggest
The prey remains are not complete skeletons. Leg elements are especially prominent, and their surfaces show the effects of digestion. Therrien interpreted this pattern as evidence that the tyrannosaur “selectively dissected away the legs to target their muscle-rich flesh and left the rest of the carcass behind.” In other words, the juvenile may have pulled meat from the limbs instead of swallowing an entire animal.
That interpretation is plausible, but it describes one individual meal. The fossil cannot establish that all young Gorgosaurus chose legs, that Citipes was a preferred prey item, or that selective feeding was common in tyrannosaurids generally.
Why growth changed the available menu
A tyrannosaur did not simply become an adult version of its juvenile self overnight. During growth, its body mass, reach, running ability, skull proportions and tooth function changed. Those changes altered which prey it could catch, subdue and process safely.
Small bodies favored manageable prey
A young tyrannosaur had less absolute strength and a smaller gape than an adult. Small vertebrates therefore offered practical advantages: they could be seized and carried without the risks involved in attacking a large, heavily defended herbivore. The Gorgosaurus stomach fossil demonstrates that small dinosaurs were within the capabilities of at least one juvenile tyrannosaurid.
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The specimen does not show whether the predator hunted the two Citipes itself, scavenged them, or obtained them during an opportunistic encounter. It does show that small theropods could make up a juvenile tyrannosaur’s most recently consumed meal.
Growing skulls expanded feeding options
Juvenile tyrannosaurs had relatively narrower, more lightly built skulls and slender teeth compared with the deep skulls and robust, bone-resistant teeth of mature animals. Mark Norell of the American Museum of Natural History described juvenile T. rex teeth as “little miniature steak knives on the side of the skull,” unlike the large bone-crushing teeth of adults.
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Evidence that older juveniles used large-bodied prey
A simple version of the story would say that juveniles ate small animals and adults suddenly moved to giant herbivores. A 2019 PeerJ report complicates that picture.
The report documented feeding traces attributed to a late-stage juvenile T. rex on a hadrosaurid tail vertebra. The marks are evidence of a feeding interaction with a large-bodied herbivore, according to the authors’ interpretation. They indicate that late juveniles or subadults could use large prey before they possessed the full adult suite of bone-crushing adaptations.
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This is not the same kind of evidence as the Gorgosaurus fossil. A bite-marked bone records contact between teeth and a carcass; it does not prove that the marked animal was swallowed, that the juvenile made the marks rather than another predator, or how often such feeding occurred. The authors’ attribution and behavioral interpretation should therefore be kept distinct from the directly observed marks.
How the main pieces of evidence compare
| Evidence | Animal and growth stage | What is directly observed | What it supports | Important limit |
|---|---|---|---|---|
| Abdominal contents | Juvenile Gorgosaurus libratus, estimated five to seven years old | Two small caenagnathid theropods, identified publicly as Citipes; leg bones show digestion | A young tyrannosaurid had recently eaten small dinosaur prey | One meal from one individual cannot define a species-wide menu |
| Feeding traces | Late-stage juvenile or subadult T. rex | Marks attributed to feeding on a hadrosaurid caudal vertebra | Some older juveniles could use large-bodied food sources | Trace attribution and behavior are interpretations; frequency is unknown |
| Comparative anatomy | Juvenile versus adult tyrannosaur skulls and teeth | Young animals had more slender, slicing teeth; adults developed deeper skulls and stronger, bone-resistant teeth | Feeding capability changed during growth | Anatomy predicts potential foods; it does not identify every actual meal |
What “as they grew” means in ecological terms
The evidence is consistent with an ontogenetic dietary shift: diet and feeding role changed as the animal matured. A small juvenile and a massive adult living in the same landscape did not necessarily compete for exactly the same food. Their different bodies could divide the available prey base by size and handling method.
Young tyrannosaurs may have pursued small dinosaurs or other suitably sized vertebrates. Larger juveniles could add portions of big carcasses, perhaps by feeding on flesh that did not require crushing heavy bones. Adults, with much greater body mass and more robust skulls, could process large herbivores and tougher tissues more effectively.
“Shift” does not mean “exclusive replacement.” A growing tyrannosaur could continue eating small prey when it was available while also exploiting larger carcasses. The fossil record does not reveal a single switch point at which small prey disappeared from the diet.
What might hatchlings have eaten?
No cited fossil in this evidence set preserves a hatchling tyrannosaur’s stomach contents. The sources therefore do not establish a detailed hatchling menu.
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An American Museum of Natural History explainer presents insects and small lizards as likely foods for juvenile T. rex, drawing partly on comparisons with early tyrannosaurs and living analogies. That is a reasonable ecological inference, not direct proof from a fossilized gut. It should not be rewritten as “all hatchlings ate insects” or applied automatically to every tyrannosaur species and ecosystem.
The same caution applies to small tyrannosaur fossils. A small skeleton may represent a juvenile of a large species, a naturally small adult species, or a specimen whose taxonomic identity remains debated. Size alone cannot turn every small tyrannosaur into a young T. rex.
Why the fossil record cannot provide a complete life-stage menu
- Stomach contents rarely fossilize in place. Soft tissues decay, bones can be scattered, and the predator’s body must be buried under conditions that preserve both skeleton and meal.
- A meal is a snapshot. The Gorgosaurus specimen records what was eaten shortly before death, not the average diet across its lifetime.
- Trace fossils require attribution. Tooth marks can be compared with tyrannosaur teeth, but the marks may represent feeding, scavenging, another predator or post-mortem damage.
- Species and regions differ. Evidence from Gorgosaurus in Alberta should not be transferred wholesale to T. rex living in another formation or ecosystem.
- Growth stages are not interchangeable. A five- to seven-year-old Gorgosaurus and a late-stage juvenile T. rex represent different taxa and may not have had identical body proportions or opportunities.
Common mistakes when describing juvenile tyrannosaur diets
“Young tyrannosaurs only ate insects.”
Insects and small lizards are proposed as likely foods for some juveniles, but the strongest direct meal evidence here is two small theropod dinosaurs. A likely food is not a documented exclusive diet.
“They switched to large prey at one exact age.”
No cited source identifies a universal age or body size for the transition. The evidence instead shows overlapping capabilities: small prey in a juvenile stomach and large-bodied feeding traces in a late juvenile or subadult.
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Both are tyrannosaurids, but they are different species from different contexts. The meal is powerful evidence for that individual Gorgosaurus, not a direct T. rex observation.
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“The stomach fossil proves selective leg feeding was normal.”
The digested leg bones support the authors’ selective-feeding interpretation. One specimen cannot measure how often that behavior occurred or whether it was typical.
“The hadrosaur bone is a juvenile T. rex meal.”
It is a feeding trace attributed to a late-stage juvenile or subadult. It demonstrates access to large-bodied food under the study’s interpretation, but it is not preserved stomach content.
The most defensible answer
Young tyrannosaurs probably broadened and changed their feeding options as their bodies and skulls matured. The strongest direct case is a five- to seven-year-old Gorgosaurus from Alberta that contained two partly digested, small caenagnathid theropods, publicly identified as Citipes. That meal shows small dinosaur prey was available to a juvenile tyrannosaurid.
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