Roaring roosters

[aislingchef]

So I've been listening to and studying my flock's language and I'm stumped on the roaring. We have two lovely boys who are the best of friends and sometimes one will stand up straight and make a roaring sound. Then the other will do it. They continue this way, getting more and more quiet as if each is trying to have the last word. I know that folks say it's a warning sound but they make a different sort of a low and urgent bokbok for that so I'm wondering if anyone else has any ideas?