i would like to see a pic of the triangle shape you refer to. I have heard of this before but never seen it. THank you.
What they're talking about is a cross section of the snake. Ball pythons natrually have a high prominent spine. Wild or thin ball pythons don't have a lot of fat reserves on the upper sides of their bodies which makes them look more traingular in cross section. Captive well fed animals have well developed fat reserves on the upper sides of their bodies which makes them look more rounded in cross section.