In my opinion, aggression in roosters is mainly due to the body language of their keepers. There are several articles on BYC about rooster behavior, and I can link you to a few of them drawn from various management styles if you wish.
I've had my share of Roosters - and never had any problems with any but 1.
As a matter of fact, we always had 2 Roosters at a time.
But this new one, which is a Rhode Island Red (about 9 or 10 lbs) is one "ornery" Rooster.
He does not like ANYONE 5 foot tall or smaller. And will attack anyone larger than that if they turn their back on him. I'm 6'3'', and he's alright with me, provided I staying facing him or parallel him. But if I turn around and put my back to him, he will attack !
He went after me (also) when I was giving the flock water, until he met the "hose".
A couple of good "squirts" with the "hose" and he stopped !
Some roosters are just that way. My Grandparents had oodles of chickens and roosters
and every once in a while there would always be an aggressive one in the bunch.
Also ~ some breeds seem to be more aggressive than others.
My Grandma always had big white chickens (and roosters) and they seemed pretty even keeled. But whenever she had a Rhode Island Rooster, 'trouble' !
And that's what we have now - a big Ol' Red Rhode Island Red.
All in all, if he's giving you warnings, he's just doing his job.
Just keep your eye on him, because he'll certainly keep his eye on you !
(We did called him "Rooster Cogburn") Now my Wife say's his name is:
Chicken Dinner" !
