We've discussed this topic here before, but for those of you unfamiliar, you can sex an adult e. indigo by simply closely examining the dorsal scales along the spine.

Males have a subtle keel that runs only about 1/5 of the scale length(right where the scale meets the body) Females lack this.

It seems to be foolproof on sexually mature couperi...but doesn't really work on the other Drymarchon.

You need to have good lighting and very good eyes...but...once you notice it, it'll be unmistakeable.

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