Not for the squeamish. This controller of vermin was checking his traps by the boat and came over to chat. He is paid to catch these 'musk rats', an introduced species that cause great problems because of the size of their tunnels that they bore through waterway banks. The reclaimed Netherlands depends on its watercourses but apart from the flooding risk caused by collapsing dykes, farmers have been drowned when the ground gives way under their tractors.