Hang strips of yellow fabric or aluminum pie pans in the area where the bird is pecking or gently spray it with water when you see it pecking. This should help deter him from pecking there and encourage him to use the nest box. If the bird is making a lot of holes in the house, then chances are he is looking for insects. Have your house inspected and treated for insects and that should take care of the problem. It is illegal in the United States to shoot or harm a woodpecker in any way.
Snakes are a much maligned creature with many myths surrounding it.
One of the most common myths about snakes is that if it has a triangular head, it is poisonous. This is not necessarilly true. Although most poisonous snakes do have triangular heads, this trait cannot be used to determine if a snake is poisonous or not. Most snakes have the ability to flatten their heads, which gives it a triangular appearance. This is especially true if the snake is irritated.