It shall be unlawful (1) to mutilate or destroy the house or den of any fur-bearing animal except where such house or den obstructs a public or private ditch or watercourse, (2) to cut down or into any tree containing the den or nest of any fur-bearing animal for the purpose of harvesting such animal, (3) to use spears or any like device in hunting any fur-bearing animal, or (4) to use explosives, chemicals, or smokers of any kind to drive any fur-bearing animal out of a hole, den, or house. Any person violating this section shall be guilty of a Class III misdemeanor and shall be fined at least fifty dollars.