I remember when I was a kid on the farm,we would release geese into the fields in the spring.They would eat all of the emerging grass,but not bother the crops.
Any bugs on the plants were dessert for the geese.
No pesticides or herbicides were needed.
They are re-discovering that "Hi Tek technology" in S.Africa vineyards.
See link below:
http://www.dw.com/en/mighty-ducks-fight-pests-in-south-africa/a-35986623
I have seen mockingbirds and Blue Jays walking down the rows of my garden,carefully eyeing every plant looking for bugs or worms.
No need for pesticides.
The Blue Jays will eat what we call June Bugs (Cotinis nitida),that most other birds will not eat,and that is especially helpful on my fig bushes.
In very dry weather, I keep a sprinkler on every day,and with a small pan to catch water,and the birds use it to bathe on the hot days of summer.
I guess they are returning the favor.
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