Ork Head

It is well known that Ork bodies are very robust, but Ork physiology is so remarkable that the brain in a detached head can survive for some time. In a desperate effort to save Ork lives, the Painboyz were forced to experiment, and attached two heads to each of the few bodies which had survived reasonably intact. The body was thus 'occupied by two Ork personalities.

'Ere We Go, Page 19