Can roosters actually work to defend against weasels though? I've heard great things about roosters for pretty much everything... except that weasels, minks, etc are very fast and fierce for their size. So I hoped to get more input on this. And yes roosters are a good idea if she's not in the city.A good rooster will defend his flock. Mine saved my hen from a hawk attack. Get one that is over a year old. There will be some fighting initially, but then things should settle down.