- I have seen an RBB on my property in SE Qld. My dog at the time alerted me to its presence. It was approximately 4m long (in 's' shape), so I imagine that stretched out it would have been approximately 6m. The body at its largest spot would have been about 120mm diameter and the head around 150-200mm long, and very big. Though it was only a few metres away from me, it seemed to be intent on going somewhere and didn't bother either me or my dog, thankfully! It was distinctly black and red.