You can tell with the aid of an eye loupe (I'm waiting for mine to be delivered) from around 5-15 grams. After that they are pretty easy to tell the difference. Below is a link to some helpful articles about sexing cresties.
http://www.jbscresties.com/sexing.html
and
http://www.pangeareptile.com/store/c...-sheet-en.html









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