While this is typically true.... it is not always. My Vanay, a proven charcoal, had light eyes.
And anery A can have dark eyes as well.
The key difference is level of contrast. Charcoals are low-contrast snakes. The saddle color and ground color are much more similar than the stark dark-light of a young anery.
For example, this is one of last year's charcoal hatchlings at 6 months old.
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