There was some discussion on this phenomena with a orange belly gene animal recently. And the fact that the animal and a sibling who had undergone a similar sudden darkening. They were not sure if it was genetic or related to a suspected bacterial infection. Very interesting. The animal shown here is amazing and does look axanthic or anerythrystic at this stage. Congrats to the owner.Actually more anery than axanthic. The orangebellys became much darker than this though.