Taxonomically speaking 'Suriname redtail' and 'Guyana redtail' are meaningless or interchangeable terms. Locality of origin is easily and definitively defined; "Where it came from".
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Many people say they see little difference between the two populations. For whatever reason a few vocal people actually campaign against there being any distinctions made between them. It's an interesting subject but the controversy has it's roots in marketing and pricing more than practically anything else.
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A nice Suriname boa sells for more than a Guyana snake (not the fault of the snakes! it's because of the thousands of wild-collected and farmed Guyana boas, many in very poor condition dumped in our market).. And in a larger sense, also because a boa of any known locality, Suriname, Guyana, Brazil, Costa Rica, Mexico, Colombia, et-al will practically always command a higher price than a similar one of unknown or mixed origin. This is the engine, so-to-speak that drives the un-ending debates. Boas of known origins do enter the country, many come in without that info. Ultimately perhaps the locality market is akin to the stock-market, it pays off because people play the game by the rules and believe in it's worth.
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Continuing; my favorite (but least popular) answer about the differences between boa locales is something like this; can't see any difference? look closer!

To the readers who don't take me seriously I can point out that at the top of this Boa forum main page there is a post where in a short time nearly 1000 people have gone to find out if their boa is
constrictor constrictor or
constrictor imperator or contribute to the subject.. There are a lot of people who for whatever reason have not yet come to appreciate some of the more subtle differences between boas and that includes redtails of Guyana and Suriname. We are all still learning..
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There's an 'official' statement on the specific issue of Suriname and Guyana boa looks in my webpage. It won't satisfy the people who want an A,B,C, 1,2,3 formula for telling the two locales apart but here's that link:
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Rio Bravo Reptiles: Suriname Red-Tails
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By the way, that's
Lampropeltis alterna in your avatar photo? There are serious and experienced people who value the info of what side of the highway those snakes may have originated from! .. wanting to keep Suriname boas and Guyana boas as seperate as possible is hardly a nutty or unique idea.
