Scorpion's Sense( Sandstorm, p. 53)
Like the scorpion, you sense other creatures simply by perceiving their contact with the sand.
You are sensitive to vibrations in the ground and can automatically pinpoint the location of anything that is moving and in contact with the ground so long as it is within 10 feet. The range expands to 20 feet if you are in an area covered in a layer of at least 1 inch of ash, dust, loose earth, or sand. This ability only tells you what square the creature is in, so you still have the normal miss chance from concealment if you cannot see the creature.