I've never had any other predator problem other than foxes, we don't have any owls around by me bigger than a barn owl and they hunt mice, not other large BOP able to take a Guinea and we don't have a stoat issue either, my neighbour breeds guineas for guard birds and chickens for showing, he's only ever lost adult birds to foxes, and his guineas live in the trees around his farm drive, I have 4 adults that are a year old and they still refuse to go up, I would like them to be tree trained so that they can be better guard birds and so they will be less maintenance than chickens but they really have turned out to be awkward little sods. Every night I wait out with them, and the chickens all go up and then the guineas just wait and wait and wait until I let them go in, I don't even feed them inside the coop/run anymore but they still won't leave smh, I'm sure they do it deliberately as surfing the day I'll come out and they will be in the trees grooming themselves or if they get scared they fly into the trees, but at night, no such luck