not necessarily. Foxes will go for the easiest target in their hunting area, and multiple roos are a deterrence. I have not suffered a fox attack since 2020, while a neighbour with just hens has lost several of them every year (and does not understand why I haven't, despite the answer staring him in the face: multiple roos on guard and everyone unconfined and free to run and hide here). The neighbour calls in a friend who hunts them, and he's seen and shot up to 3 at a time in fields around our garden, so they are here.
Your (and presumably your cousin's) problem is your roos are young and have no senior roo to guide them. One or both may fall victim while they are acquiring the necessary experience to protect the flock. But any survivor can train the next one and they'll get better. This is what it looks like when they know what they're doing: roos on the outside, hens in the middle, all acting on instinct and me viewing through a window:
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