I totally agree with chickless - I have 12 geese, Embdens and Toulouse, I also have 46 Chickens, 14 ducks, 8 Guinea Fowl and 2 Goats and I would not leave any of them to fend for themselves especially overnight, yes they can all make a lot of noise if a predator is around but they are defenseless against foxes and the birds can easily be taken by eagles - I witnessed an eagle pick up one of my Muscovy Ducks, fortunately the eagle dropped her back into the water and she swam back to me unharmed - I have seen deer killed nearby by foxes - it is your responsibility to ensure your birds are protected - even my dogs aren't a deterrent for a hungry predator.... please don't depend upon any source other than yourself to protect your animals.
Best wishes
Suzie