We have several pairs of ruby throats nest near our farmyard and when the first broods fledged there were 7-8 birds visiting our three feeders, fighting, chasing, etc. About three weeks ago they seemed to suddenly disappear and altho we since witnessed one male courting a female, there has been almost no activity. We thought perhaps the hot weather sent them into the woods, and it was true that when it cooled off, a few reappeared, but certainly not in the numbers we saw earlier. A neighbor has commented upon the same phenomenon. We have seen no dead birds, but could this be West Nile or other disease?