According to a study published in the journal Science Advances, the hind limbs of two small bird-like dinosaurs called citipes were found beneath the rib cage of a juvenile gorgosaurus, a close cousin of the Tyrannosaurus rex.
We now know that these teenage (tyrannosaurs) hunted small, young dinosaurs. These smaller, immature tyrannosaurs were probably not ready to jump into a group of horned dinosaurs, where the adults weighed thousands of kilograms.
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