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. Evidence indicates the dinosaur consumed a feathered creature. It could shed light on how certain feathered birds made it through. A new study lays out these findings. It gives us a snapshot of ancient predator-prey interaction.