In his recent book The God Delusion, Richard Dawkins writes:

“One of the cleverer and more mature of my undergraduate contemporaries, who was deeply religious, went camping in the Scottish isles. In the middle of the night he and his girlfriend were woken in their tent by the voice of the devil, Satan himself; there could be no possible doubt: the voice was in every sense diabolical. My friend would never forget this horrifying experience, and it was one of the factors that later drove him to be ordained. My youthful self was impressed by this story, and recounted it to a gathering of zoologists relaxing in the Rose and Crown Inn, Oxford. Two of them happened to be experienced ornithologists, and they roared with laughter. ‘Manx Shearwater!’ they shouted in delighted chorus. One of then added that the diabolical shrieks and cackles of this species have earned it, in various parts of the world and various languages, the local nickname ‘Devil Bird’.”

Here is a recording of the bird: