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This is an unreliable method of sexing most species. Males do not always have larger spurs, and sometimes they can be very close in size. The only snakes that can be reliably sexed by spurs are the erycines (the females lack them altogether).
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Linds,
You are correct that it is not 100% reliable but it is a good indicator. This is why I posted this in my last post...
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I prefer popping very small boas and probing juvenile/adult boas whose sex can't be determined by their spurs.
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If a boa has extremely large spurs it is a safe bet that it is a male. All of my males have visibly larger spurs than my females. You are 100% correct that spur size is not reliable for all boids.
Here is a quote from VPI
In most cases, the size and shape of spurs are an indicator of the sex of a boa or python, but this is not always an accurate means to determine sex with certainty.