Man, that sounds like a terrible situation...I'd be confining my birds to protect them.
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I feel for you regarding your birds and very unpleasant neighbors.
Can you not make an unofficial / official complaint to your friends who own the property and give them grounds to tell there tenants to stop upsetting the neighbors and there pets and to prevent there kids n dog from trespassing on neighboring properties immediately or the police will be contacted and tell them they have to leave immediately or how ever long they have to give them notice for?
Maikan
I'd just call the cops on them.
The way things are these days, the cops aren't leaving until someone or something gets shot.