Juvenile Gorgosaurus' Diet Revealed in Fossil Discovery

The dinosaur, a relative of the T-Rex, was found with the remains of two infant Citipes in its stomach, shedding light on the changing diets of tyrannosaurs as they aged.

A fossilized juvenile Gorgosaurus libratus, a relative of the Tyrannosaurus Rex, was found with the remains of two infant Citipes, a small bird-like dinosaur species, in its stomach.
The Gorgosaurus, which lived around 75 million years ago, was about 5 years old when it died and weighed just under 750 pounds.
The Citipes' legs were at different stages of digestion, indicating they had been eaten days apart, suggesting that baby Citipes may have been a favorite meal for juvenile Gorgosaurs.
Adult Gorgosaurus are believed to have hunted large herbivores, indicating that the species' diets changed as they grew.
The discovery provides the first direct evidence of the diet of tyrannosaurs and suggests that they occupied different ecological niches as they aged.