Its not the scientific name of the snake. The snakes name is either boa constrictor constrictor or boa constrictor imperator. Red tail boa is a bull:cens0r::cens0r::cens0r::cens0r: term created by the pet trade. And then they added the term „true red tail“ for boa constrictor constrictor because their tails have darker red color than boa constrictor imperator. Both have red tails, it’s just that one is darker than the other.. lol
Actually it has been changed. They are considered separate species now. BCC has been changed to Boa Constrictor and BCI has been changed to Boa Imperator. Old dogs like me though still call them BCI and BCC although technically they are now BC and BI.
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