My old hen will try to steal chicks even if she did not set on eggs...............I had the same problem with my last hatch. I'd never had two broodies before, but you live and learn. I think I ended up with such a horrible hatch rate because of the stealing going on. Now I know to separate them.
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She hears the chirp and stalks until she gets a chance to grab it..................it is toooo funny...........