Where I trap,the muck around the rat houses is 2 to 3 feet deep.Very hard to find entrances,if you can,the colony traps are great.
It is against the law here ,to damage the houses.I take my fist,and right at the water line I punch an indentation.The trap is placed in front of this indentation,it is visble for a long ways,and all rats ,mink and coon are drawn to it.
Tom