What are Pitfall Traps? How do they even Work? How may be it Useful for Abundance and Distribution?

-This is your Cartoon Style Traps - Container that are in a Hole, which is Covered with Nature or Wooden Pile supported by Pebbles. -Insects on the Ground will Fall because there is also Food in the Container. -Leaving it Overnight will give you a Number of Insects in that Sample Area - do the Same in the Next Night in a Different Sampling Area and then Compare the Results.