Rust Beetle
A new creature has been spotted hiding in remote mining caves: the rust beetle. A group of explorers looking for Western Orcs saw the ellusive beetle. One of them swears he saw an orc ride the beetle but that has not been confirmed. The beetle appeared to be mining for them and at one point it even changed color to match the ore it found.
They saw the orcs tell it to "take break" when they were finished mining. Other commands and abilities are thus far unknown.
The explorers did say they didn't see any of the beetles near known Western Orc outposts so they must be taming them somewhere else.