Mark,

I am not looking at the vent as much as the length and shape of the tail. Females tails tend to be shorter, and taper more quickly. Males tails tend to be longer and thicker post vent.

These are not the best pictures, but they are the only ones I could find with a male/female of similar size.

Snake of the left is female, snake on the right is male. Note the male has larger spurs as well.






As far as your sand boa goes, I am leaning toward it being a male.... to me the tail length/shape says male. I checked a few of my adult males and they all have larger spurs than the one in your photo though. It is harder to judge from the photo than I had thought... maybe others will chime in with their opinion.

-Chris
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Christopher E. Smith
Contact
Captive Bred Herps
Wildlife Research & Consulting Services, LLC

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