I was right then? They are from the "red group"? Wow, lucky guess! lol. They are just a Pastel that EBV has "fine tuned" to produce intense reds throughout the snake's body. Nice looking Pastel line. SalmonBoa works with a few of them. I don't think they are smaller or larger than any other boas though. Maybe he's just a runt, lol. Didn't you say he was on only mice when you got him? Or was that someone else? Diet can really play a part with boas, if they are not fed large enough meals they can be "stunted" but with horrible side effects if done for too long.