National Geographic : 1946 Jun
The Worm Turns 777 Guided by His Head Lamp, a "Sniper" Stalks Sandworms on a Maine Tidal Flat A night picker is called a sniper because he must be so stealthy. He walks in a crouch, poised for pouncing. His free hand must be quick, for the elusive worm, sensitive to thud of boots and glimmer of light, recoils into its burrow on a second's warning. An unusually good night's work may net 1,000 worms (page 778).