personally I have allways been able to eyeball. They have the same bulge for male skiny tail for female that most Oglyphs and colubrids have. It is best to have several to compare from because these are a bit trickier...due to the slender body-long tail. I suppose that the hemipenes could be popped but I am not a fan of doing so...Especially to such delicate snakes. If you really want to bred I would suggest hedging your bets anyway and getting two pairs, as these are inexpensive and it increases your chance of success...Frank

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