But they can be territorial and protective of what they regard as “their” hens. That's part of their charm, of course, but when they compete with one another too much, they can hurt each other, or even hurt the hens! When you have multiple roosters in your flock, that protective instinct can get out of hand.

How does one rooster kill another?

They kick and duel in mid-air, striking at each other with feet and beak.” If the fighting wanes, handlers pick up the birds and blow on their backs, yank at their beaks, or hold them beak-to-beak in an attempt to work them back into a frenzy.

Do Roosters attack other roosters?

Why Roosters Attack

It's just a fact about chickens, in the flock, there is a strict pecking order. If you keep more than one rooster in the same flock, they will challenge each other to establish dominance.