Fossil Shows Tyrannosaurs Fed on Their Own

A 75-million-year-old foot bone has exposed a brutal detail about tyrannosaur survival: these giant predators sometimes fed on their own kind.

New research, based on high-resolution 3D scans, identified clear bite marks on a massive tyrannosaur foot bone, according to reports. The marks suggest a smaller tyrannosaur fed on the carcass of a much larger relative after death. That finding shifts the image of tyrannosaurs away from pure top-of-the-food-chain hunters and toward something more flexible, and more unsettling: opportunists that took food where they found it.

The fossil record now points to tyrannosaurs not just as killers, but as scavengers willing to feed on other tyrannosaurs when the chance appeared.

The evidence matters because it rests on unusually precise analysis rather than broad speculation. Researchers used 3D scanning to map the bite marks and connect them to a tyrannosaur jaw, reports indicate. That approach gives scientists a sharper way to test behavior from bone damage alone, especially in cases where direct observation will always remain impossible.

The discovery also adds nuance to how paleontologists think about apex predators in ancient ecosystems. Even dominant hunters face injury, scarcity, and competition. In that world, scavenging another large predator may have reflected practicality rather than rarity. Sources suggest the fossil captures one moment in that harsher reality, preserved in tooth scores on bone.

What comes next will likely matter beyond tyrannosaurs. Researchers can now use similar scanning methods to revisit old fossils and test long-standing assumptions about dinosaur behavior. If more bones show the same pattern, scientists may redraw the social and feeding habits of some of prehistory's most famous animals with far more confidence.