Red grouse grit tray, Gunnerside Gill

Red grouse grit tray beside the track at Botcher Gill Gate, Gunnerside in the Yorkshire Dales.
Grouse ingest grit to break down their food before digestion. When the shooting season ends, the grit is coated with a chemical to kill any worms in the gut. If left untreated, the worms can kill the bird.