I have two active experiments going this year to see if the chickens will control the squash (stink) bugs. I have several squash planted out in the yard where the chickens have access to them while free ranging (not confined like in a run where they would destroy the plants) Even though I have been picking eggs and bugs off the ones in the garden for a couple of weeks I haven't found any on those squash yet, but it is still to early to tell if it will really work.
The other plan hasn't started yet. I am going to have very young chicks soon that I plan to brood outside and allow access to garden areas w/ large squash plants as part of their nursery run, I am going to see if they will eat the insects, but not hurt the plants being very small chicks.