Wondering if it was possible to sex a Mali. By Color. Thanks

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Wondering if it was possible to sex a Mali. By Color. Thanks

I have no idea how to tell. I had a big mali, i was CONVINCED that it was a male and told so by the reptile "zoo" and my exotic vets told me they didn't know how to sex a uro... plus if you go on Doug Dix (he's a zoologist and breeder) he has photos of the sexes.. males are usually more black and yellow but then i guess there are "male mimics" which was what mine was b/c she looked like the males on Dix's site but was a female! I didn't realize it was a girl until "uri" started poppin' out EGGS!! oh my that was a surprise..
so NO, i have NO idea how to sex a uro.. sorry
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4.2 Bearded dragons (Lee,Stumpy,Blackie,Spazz,Lynn,Charlotte)
1 Egyptian Uromastyx (Niles)
(Papa Kunja and Uri have recently passed..we love you)
Thank you for your advice! 
I don't know how to sex it with my eyes, but as far as i know it can be sexed my checking bottom side of the body...area around rear legs...that's how i predict my Taias sex and then vet confirmed it...females have black dots or something, i already forgot...but that's with Hardwicki, not sure how to sex Egyptian
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1.0.0 Ball python (Oz)
0.1.0 Hardwicki Uro (Taia)
0.1.0 Black cat (Tomika)just been operated for breast cancer
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