My backyard is like a farm, and I want llamas, but?

I already have free-roaming ducks, turtles, silkies(chickens), and some horses(in a yard due to size) but will 2-3 llamas wondering around my backyard hurt my existing animals? I read on wikipedia that they can be easily trained to protect some animals, I will get to that just as I am about to get them, I want the llamas to be free-roaming, I have a well fenced yard.