What happens next?

How to keep birds out of a barn
Keep your grain in bird-proof containers.
If birds have easy access to your grain, they'll associate your barn with food and keep coming back. To prevent that from happening, store your grain in bird-proof containers so birds can't get to it.

Options are: a). Large garbage bins with lids and sealable plastic containers are good bird-proof options for storing your grain. Use covered feeders to feed your barn animals.; b). If you have pigeon droppings in your milk cartons, don't dump them in your barn. Birds will see these as food; however, they won't naturally pick up droppings.; c). Make sure your containers never exceed three inches or less in height. You don't want birds hitting the grain's surface.; d). Choose wooden, plastic, and polyurethane containers so birds can't use them on trees and bushes. The container should have holes in the bottom to let sunlight in.;
a).