The feeding card is one reason, I do understand the breeder could of not updated the card with every feed. Also this thread (link below) mentions a boa that was picked up about a year ago, at the time weighing 200g, now weighing 1380g. I was thinking if mine was born on 4/2011 based on this boa, mine should weigh more?
http://ball-pythons.net/forums/showt...319-Boa-update!
Here are some better pictures.
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