this is very normal for the kenyan sand boa. These animals have a very wide variation of color that is natualy occuring. Much of the color differences that we see have to do with different subspecies/localities being bred together over the years. What you are seeing in this animal is the yellow color associated with the egyption sand boa. Even if there was no other species bred together there are still many different shades on the market, many of which are animals that have been line bred for specific traits/colors.

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Steve Perry
North Idaho.