Neb. Rev. Stat. § 60-6,342

It shall be unlawful for any person to shoot, take, hunt, or kill or attempt to shoot, take, hunt, or kill any wild animal or bird from or with a snowmobile or for any person to carry or possess any shotgun or rimfire rifle while operating or riding on a snowmobile, or for any person to carry or possess any firearm, bow and arrow, or other projectile device on a snowmobile unless such bow and arrow or projectile device is enclosed in a car carrying case or such firearm is unloaded and enclosed in a carrying case.