The other five have sunk each a vertical well at the very foot of the straws which indicate the position of the buried fungi.
Next morning the sixth straw has its burrow like the rest.
It is time to see what is happening underground.

The sand is methodically removed in vertical slices.

At the bottom of each burrow is a Bolboceras engaged in eating its truffle.
Let us repeat the experiment with the partly eaten fungi.

The result is the same.

In one short night the food is divined under its covering of sand and attained by means of a burrow which descends as straight as a plumb-line to the point where the fungus lies.