Spear traps are simple devices designed to capture or injure intruders. They typically consist of a mechanism that releases a sharpened spear or spike when triggered, often hidden under leaves or debris. These traps have been used historically in various cultures for hunting or defense. The design of spear traps can vary, but they usually involve a tensioned system that activates when someone steps on a trigger. While effective in their purpose, spear traps can be dangerous and are often associated with booby traps in military or survival contexts. Proper knowledge and caution are essential when dealing with such devices.