You may have done some research, but none of your examples are from Rosy-specific sites.
IMO, the most accurate way to sex a rosy is a visual inspection of the presence or absence of spurs.
1. No spurs = female
2. Well defined, pointed & curved spurs = male
3. 1 spur, small and/or bulbous spurs = probable female

Probing is problematic with rosies. I have personally seen well-intentioned pet store employees mislabel sex based on incorrect probing.
I've seen a number of posts on the subject on the rosy forums and on Facebook and the majority of experienced rosy-keepers will agree.
I've had nearly 1,000 rosies born since I started breeding them and I can't recall ever being wrong unless the spurs fell into the 3rd category above.
Link


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Thanks,
-JC
www.rosyboas.to

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