Aaron,

That is just a perfect explanation. I am also surprised there wasn't more comments about this but yours cannot be more crystal clear. I also was told from a few people that Black Gap Alterna can grow quite large, some can reach 3 1/2 to an amazing 4 feet but most typically 3 feet.

By the way, I just acquired a real nice dark Gap male from Shannon Brown. He is even darker and more busy than the actual picture. He has a silver head as well! I will post the picture in a few minutes.
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You can never have only one snake!