When we kept guinea fowl they were exceptionally good at spotting buzzards and would give the alarm call well before the other poultry realised there was a problem. None of our birds are free-ranging at present as we have a very bold fox that's been seen near the farmyard on a nuber of occasions in the daytime. The chap who controls vermin on the common land near us has shot 40 so far this year, some of the males castrated, and our neighbour has shot 14, so they've been dumped from a town or city - that is far in excess of the number this area would normally support.