This chapter, except as otherwise provided in this title, does not prohibit the discharge of any rifle, shotgun, pistol, revolver or firearm of any kind, or the shooting of any arrow or other missile when necessary so to do to protect life or property, or to destroy or kill any predatory or dangerous animal, nor does this chapter prohibit the discharge of any rifle, shotgun, pistol or revolver at an approved firing range. An approved firing range is one which has been certified as safe by the city council of the city. (1960 Code)