I have visited three small farms in our area and made the following observations.
Farm One - raises lot poultry around the farm house, and I saw very few grasshoppers, but it was hard to walk around with all of the chickens and ducks about - we are talking well over fifty birds walking around and tons of cages filled with birds of all types and ages stacked around in a very small space. Further out from the house around pasture area and cows, there were tons of grasshoppers, very thick!
Farm Two - No grasshoppers to be found!! Beautiful garden and young pecan trees, children and animals playing happily! There was a mommy cat with two kittens, a peacock, a handful of ducks, two beautiful Blue Slate turkeys, some chickens and about ten guineas. The owner said that between the birds, especially the guineas, they have controlled the grasshoppers. As soon as I drove off of his property, grasshoppers were flying everywhere.
Farm Three - Only grasshopper some-what free area was in the immediate area of the chicken pens and runs. Owner did just purchase guineas to try to help with snake and grasshopper issues. She is having more snake problems, so not too concerned with grasshoppers. Three of her horses were bitten in the nose by rattlesnakes, one seriously injured, and snakes are eating her eggs and silkies.
In conclusion from my farm visits, I am first, grateful that I am dealing with a grasshopper infestation and not a snake infestation, I do NOT like snakes! Second, I think we are on the right path with the ducks and probably need to look into guineas. Last but not least, as much as I love chickens and ducks and turkeys, there is a point where a person can have way too many in a small space, making what should be enjoyable into something that is almost a nightmare.