Thought I'd stick a few cents worth of opinion on this as I happen to live on about 40 wooded acres in Delaware and have the three worst predators a flock has to deal with, Fox, Raccoon, Hawk and Opossum, pretty much in that order.
I think at last count a couples of days ago there were 59 Guinea's running free range along with 3 Roo's.There are a couple of things you can do to protect your birds during the day, and lockup in a secure area works at night.
I have 6 flashing red lights and then have taken and hung cd's from tree limbs all around. As it gets to dusk, and before all the flock has returned to the houses and we have locked the doors is the most dangerous time, at least for my flock. The one thing the Fox and R'coon do not want to deal with is the sight of red. It thinks it is a set of eyes. White lights will do little if anything.
With the cd's hanging from the trees the area really flashes with contant red light beams reflected of them.
As for the Hawk...now that is a different story all together. Because of the canopy we don't have many...but little stops them. I have had one fly down and grab a Guinea while I was standing right there. That one was not funny at all. We have found the red lights and reflections don't do a thing.
The radio on all day between the coops....we think it works. As suggested put it on a talk radio show or NPR and turn it up a bit. The predator thinks someone is there.
For the opossum.... he is just curious and it looking to eat the Guinea eggs if they lay in a new area I cannot find. You trying looking in 40 acres of woods for where your eggs are! That is why this old codger uses a golf cart.
We do set 6 Hav-A-Heart traps at this time a year and relocate the opossums.
Hope this has something someone might use to keep their flock safe at dusk.
