In an effort to keep bugs down in a food forest, would it be a good idea to use chickens for day time pest control, and bats as night time pest control?
My wife and I have about 100 free-ranging chickens. For bug control, they are a mixed blessing. Chickens eat just about any kind of insect they can find, excepting small ants, and thank goodness they don't appear to eat bees. But they also eat frogs and lizards, which also eat insects. We try to create environments where the frogs and lizards can hide during the day, and then they come out at night.
Here is a strange bit of trivia... Despite growing up watching cartoons where the number one thing that a chicken loves is earthworms, none of our chickens (many different breeds) have ever shown any interest at all in earthworms.
Our property also has bats, which we intend to further encourage by building a bat house. The bats largely eat flying insects like mosquitoes and moths. I doubt mosquitoes are interested in your food forest, but obviously the moths would be.
Obviously, the bats don't bother the chickens and the chickens don't bother the bats.
An excellent addition for your food forest is lady bugs. They eat all sorts of small critters that feast on your food forest.