I can expect you to know the difference of a cross and a pure considering your background. So I trust your judgement. Maybe you can share what it is that makes the difference so that he can get a pure group of these without guessing at it. I have had three spacific types of Uroplatus in the past and one of those was a natural accuring cross. I could tell the difference of all three by a few differences. They all had pattern variation so the differences where more permanint traits, example... the eyes, scalation and indentations under the arms...maybe the goannas have traits like this?

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