What characteristic of a normal Ball Python's ventral side contrasts most significantly with the Yellow Belly morph?

The normal belly is creamy white or pale yellow, often nearly immaculate with only faint, sparse dark smudging

The key to identifying the Yellow Belly morph often relies on observing the ventral surface because the standard Ball Python belly is typically a uniform, light color—creamy white or pale yellow. This normal belly surface is usually very clean, perhaps showing only minimal, faint, sparse dark smudging that is rarely prominent or disruptive to the overall pale tone. The Yellow Belly drastically deviates from this norm by introducing consistent, distinct dark spotting or smudging scattered across this light background. This consistent interruption of the uniformity on the underside provides a clear marker distinguishing it from the generally immaculate ventral presentation of a standard or normal Ball Python.