At Leicestershire, there was a superstition that the seven whistlers were seven birds whose voices warned the colliers in that locality of impending danger. It was said that formerly, at least, no one would descend a pit if he heard the seven whistlers, whose prophetic notes no miner would ignore.
- Hazlitt, W. Carew. (1905). Faith and Folklore. 2 vols. London: Reeves and Turner, p. 2:540.