Ravens. I would love it if a family of them would settle in on my property somewhere!Lots of liege fighter hatching eggs on eBay. But if you're after a giant chicken, you can also look at Indio Gigantes, Shamo, or Malays.
And it's not so much that the Cemanis are that much more protective. I've heard it's because they look like big crows so scare some birds of prey away because they don't want to mess with crows (or ravens. Not sure which.)