The reason why they're rare is because you're fighting against odds and potential deformities associated with super black pastels.
Depending on the pairing (black pastel het pied x black pastel het pied for example), it is a 1/16 (6.25%) shot to produce a panda pied offspring in the clutch.
Using a black pastel pied x black pastel het pied still renders a 1/8 (12.5%) odds to produce a panda pied. Using two black pastel pieds gives a 25% shot.
Not to mention many super blacks are often culled or fail to thrive due to spinal kinks or facial deformities. So on top of those small odds of actually producing a super black, the question is how many of those actually hatch out healthy?
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