Rig a perimeter alarm yourself
If your camping or hiking trip entails sleeping outside in a place where predators roam, it’s recommended to consider bringing supplies to rig an alarm system. This may seem exaggerated, but, after all, it’s better to be safe than sorry.
What’s needed is some wire, some inert grenade tops, and firecrackers. First, anchor the wire by tying it around a nail. Then, hammer the grenade tops around the perimeter, and pass the cables through the pins. Finally, fill the hole on top of the head with firecrackers.