I recently posted enquiring about loosing a couple of birds that seemed to get ill and die recently, I tried a sour crop remedy, the birds have been wormed and demited, their are several gum trees in their coop, big ones, and a mirage of birds seem to inhabit them, wattle birds, crows, the sometimes kookaburras, any way Iwas wondering if any of these or even rats can pass anything on to the hens?