Mousetrap

From the Metal Gear Wiki

"That mousetrap is a portable tool for capturing small animals alive."

— Sigint

The mousetrap is an item Naked Snake uses during the Virtuous Mission and Operation Snake Eater. It is used to catch food alive, such as snakes, birds, frogs, and other animals Naked Snake encounters on his missions. It must be used to catch the invisible Tsuchinoko.