Moles are more intelligent than man. When we had one in our garden, we tried all the popular means of scaring it away: nothing worked. As in Germany they are a protected species (I am at a loss why because almost every meadow I see around here seems to be riddled with molehills), so you mustn't kill them. Anway, to protect our precious lawn, we tried the ultimate solution and installed a mole-trap (You can buy them in spite of the ban to kill moles. How crazy is that?). The mole must have laughed out loud at us by then because, guess what? It just dug a new burrow around the trap!