Ingo,

I have noticed with some G. nigrolineatus that I have that they all appear to have lost some portion of the tips of their tails [all wild-caught], and although it's noticeable, it's not nearly as obvious as in some lizards like iguanas or many of the gecko species.
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Matt Campbell
25 years herp keeping experience
Full-time zookeeper
Personal collection - 21 snakes (9 genera), 20 lizards (4 genera), 6 chelonians (2 genera)