There would be some fairly high-pitched squeals, then he'd lunge at the nearest War Elephant and try to eat it. After a few seconds he'd get bored and drape something over his head, but by then the Welly would be unusable and covered in gunge. I don't know why we haven't deployed him already...
Completed: RB Demogame - Gillette, PBEM46, Pitboss 13, Pitboss 18, Pitboss 30, Pitboss 31, Pitboss 38, Pitboss 42, Pitboss 46, Pitboss 52 (Pindicator's game), Pitboss 57
In progress: Rimworld
In progress: Rimworld