O.S. Odd Brazilian Rainbow Boa Sibling This is the sibling and as you can see basically this snake has the typical BRB pattern however the overall colors are not normal at all. The crescents are bright yellow and the body color is more of a brownish sort of coloration that is not easy to picture or describe. One way or the other this pair is fun and I can't wait to see what they produce. This pair is called O.S. as they where produced at Ophiological Services.