Food is one of the hardest things to come by in the wild. In a survival situation traps can do the work of hunting for you while you make shelter, create fire, and find water. The Paiute is the easiest deadfall because all you need is a piece of string or a shoelace.
Step 1: Materials
Hammer: large flat rock (the bigger and flatter the better).
Main support: Y-ed 1-2 inch by one and a half foot stick
Lever: 1 foot by 1" strong stick
Toggle 3"-3/8 inch twig
Trigger inflexible twig as long as the rock
All the measurements are very flexible and are just general guidelines.