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from what i have heard from many people u have to probe tegus and monitors to determine their sex
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If you try and probe a tegu or varanid, all you'll do is either...
Nothing, since the cloacal muscles are strong enough to prevent easy insertion of the probe...
Or...
Very literally "rip them a new one" as you force it in despite the muscles attempting to prevent this...
Sonograms are reputed to be fairly accurate for detecting the inverted hemipenes and there's always the tried and true classic method of prolapsation via saline injection... in a number of animals, both teiids and varanids, the males will often evert if you roll them on their back or apply a gentle pressure... they also often release some unpleasant liquids though, so attempt this at your own risk and with your mouth closed.
Always with your mouth closed.