Plains                                                 -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

Several small burrowing holes, not even the size of your thumb, line the
trail.  You peek down into one of them and notice a small group of baby
brain moles waiting for their mother to return with some psi-energy to feed
them.  Moving on would be a good idea, unless you wish to be the source of
psi-energy for the meal.  

A tiny brain mole no bigger then your index finger, feeds off your psi aura.