I knew a guy that had a few about 12 years ago. I went to check out his collection and when I asked him about their care, he said basically identical to trans-pecos ratsnakes.

no clue why they arent bred in larger numbers though. I think they are nice looking animals.
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1.1 Argentine Boas
1.1 Dumerils Boas
1.1 Black Milk Snakes
2.3 California King Snakes
1.1 Nelsons Milk Snakes
2.2 Corn Snakes