Thanks for sharing the pictures. I have a male silverback that's only a year old but wow what cool boas. These guys are my favorite. There seems to be some confusion about bloodlines though. Silverbacks particularly. Mine was sold to me as a bolivian silverback. Originating from joe terry bloodline. But when I do deep research it seems that true silverbacks come from the Sao Paolo region of south Brazil. For example see http://www.boa-constrictors.com/com/Amarali/usfehlinfo.html
My Amarali Looks like a true silverback.

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