An informer to the authorities, especially one who gives up criminal associates.
A pigeon tied to a stool by a piece of twine, used as a decoy to entice free-flying birds to the ground to be shot or trapped.
One who tattles (notifies authorities of illicit behavior) or is inclined to do so; a tattletale.
Either of two similar bird species in the shorebird genus Heteroscelus (Tringa in some taxonomies).
A device fitted to a vehicle to measure mileage etc.