Two baby dinosaurs found in tyrannosaur fossil shed light on changing diet

Undated handout photo issued by the Naturalis Biodiversity Centre of the skeleton of a Tyrannosaurus rex in a room of the Naturalis Biodiversity Center in Leiden, Netherlands (Marten van Dijl/Naturalis Biodiversity Center/ PA)

The remains of two baby dinosaurs have been discovered inside the fossil of a 75-million-year-old tyrannosaur, shedding new light on the changing diet of the ancient predators.

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.