Trapping definitely helps and it's just another piece of the puzzle. For some people, such as lease holders who can't manipulate the habitat, it's the biggest thing that can be done. It's time consuming and not a one time thing, but I've personally experienced the turn around in nest success. The spring after we removed 150 coons and possums in a little over a year I saw a couple of hens with 18+ poults. Was there a third hen I didn't see ? Maybe, but either way it was a good hatch. Have also seen good hatches the past two springs and we continue to work on nest predators all we can.