Alas! I have researched the web and found no information on this trap, fortunately, I still remember it when it was taught to me by a cousin 28 years ago while I was on summer vacation in the countryside. What better place to document it than http://www.instructables.com! So here goes...
Imagine being stranded on an island or trying to rebuild a community after a zombie apocalypse and you find some chickens! Hunting them would be simple for most, but you want to capture and domesticate them for the eggs! Here I present to you the knowledge on how to build a simple chicken trap, the ancient way!
Step 1: Gather the materials
You will need the following:
1. A coconut or other bowl-shaped container (half a coconut if you are stranded on an island, an ordinary bowl or even a ramen noodle plastic bowl would do for urban setting)
2. the spring mechanism, coconut frond midrib (pickup the dried fronds, not fresh as they are flexible, mostly used for weaving) or fashion some from bamboo or wooden skewers or twigs. plastic pickup sticks would also do! you can find and improvise on a lot of materials for this once you see the assembled trap.
3. a string or light rope. for the island scenario, you can gather some from local flora or fashion a rope from the coconut husk strands as shown in the picture below. for urban setting, you can find a lot to use ranging from making some from your shirt, using shoelaces, paracord, etc. also shown is the dried coconut husk where you can get the fibers.