The Butter Motley pictured is not actually a Motley but rather a Motley Stripe a combo of both pattern morphs. The enlongated "saddles" or broken stripes are a dead giveaway there

Motley is a genetic pattern mutation as is striped.
Both are similar & can be combined together as well. Motley & striped snakes do not have the typical "checkered" corn patterns on their bellies as "regular" patterned corns do.
Stripes are very easy to tell of course but many normal patterned snakes appear somewhat Motley in appearence. The lack of pattern on the bellies is what determines it for sure.
Both Motley & stripes are recessive genes as well, Mark
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