Scientists have made an unusual discovery inside fossilised dinosaur droppings: a bird feather. The dropping itself is very old, dated to 66 million years ago. The waste is linked to a Tyrannosaur, a fearsome predator. Seeing a feather in such good condition is very uncommon. This gives scientists a direct look at the dinosaur's diet. The feather shows the dinosaur had eaten a bird. The discovery may help us understand bird survival after the extinction. These findings are detailed in a new scientific study. It offers a snapshot of a predator and its prey.