Will a rooster protect ducks
that are part of his flock?
I think it would depend on
the rooster.
Our rooster seems somewhat
indifferent to ducks. I’ve observed him leaving the ducks by themselves
to tend to one of his ladies. He might attack a predator that is
threatening his flock and the ducks, but I doubt if he would intervene
if a hawk was trying to eat one of our ducks.