User blog comment:Mckrongs/Rust Duramboros Discussion/@comment-3133156-20111022150546

I think the color variations pretty much come from the diet of what he is eating for example a normal Dobo would be green because it eats mossy wood. The Dobo sub would be yellow/brown from the exposure of sand + dried wood and trees diet from the Desert as you can see there ARE trees in the Desert area and the Dobo sub might be able to break em down and eat them.