I haven't seen the neighbors spraying anything, but I don't live with my boyfriend so I'm not there all the time, so I guess that's a possibility. None of the other animals are having issues though, so think it could still be that? The dogs are outside several times a day and are fine, whereas the birds are never outside, obviously. I've never heard the thing about the Teflon, so that's an interesting one. I just don't know, and it really bugs me. He did have loud music on when the first one happened and we were watching a movie with the second, but I don't see how the noise could be a factor. We've watched a million movies and listened to music tons of times around them, so why would that all of a sudden make a difference? It wasn't any louder than before, and I think it's odd they both died within 2 days of each other, the exact same way. I think it has to be something else other than the music/movie volume. That's what he's worried about- That it was too loud or something. He did move about 2 months ago, but they haven't seemed stressed and again- it's been 2 months. If that would've done it, I'd think it would've been sooner.Sorry, I know I'm rambling, I'm just trying to make sense of it, and I'd like to figure it out because there still is one left. I think I'll do some poking around on-line and see what I can find, too and if that doesn't get me anywhere maybe call a vet?