I finally managed to convert my image.
I had taken the 100-400 lens and was filming. Then stopped to watch the python. However, I was not prepared for this action. I just raised my camera and fired from a half-cock position. Fortunately, after carrying the heavy 400mm f2.8 L IS USM lens, the 100-400 seemed pretty light weight
Canon EOS 1D Mark IV, Canon EF 100-400 f3.5-5.6 L IS USM lens, ISO 200, f6.3, 1/400, full frame image.
I have photographed phython's many times. However, this was special. I had never seen this before.
After uploading this image, I realised that the copyright is intruding. Sorry for that.