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. It is thought to have been left by a Tyrannosaur. The feather is exceptionally well preserved, which is a rare find. The find offers direct proof of the predator's meal. Evidence indicates the dinosaur consumed a feathered creature. 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.