What specialized role does the Whimbrel's bill take on during subterranean hunting?

Answer

An advanced, subsurface sensory probe

The function of the bill in finding buried food is described as operating less like simple tongs and more like an advanced tool designed for subsurface sensory detection.

What specialized role does the Whimbrel's bill take on during subterranean hunting?
foodbehaviorbirdwhimbrelforaging