This is a species I've created.
Battle dragons are large bulky dragons. They communicate to each other from far distances by the sounds they can make from their horns. Each frequency means something different, which makes them great for relaying information. So that they can organize themselves to have a better chance of victory.

They ram their heads into each other, building up the bone underneath. A sign of a well trained and powerful Battle Dragon is the size of the ridge over their eyes.

The club at the end of their tail may be small but it's powerful enough to smash through boulders.

Most Battle Dragons have a range of yellows, greens, and browns for their color scheme.