A lot of snakes have what is called "iridescence" (the shiny rainbow appearance similar to that found in oil slicks). Rainbow Boas have a very prominant iridescence, hence the name. It is probably just a nice looking Boa Constrictor. Lots of people call normal Boas red-tails, even if they aren't true red-tails. Rainbow Boas and Boa Constrictors CANNOT be crossed. I haven't heard of any Boids of different genus crossing, other than Some Morelia and Liasis species, and that I am sure is very difficult.
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