User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6050823-20140517010752/@comment-5043481-20140518212448

Well, someone forgot to read his own comment.

Maybe the azure/pink and silver/gold raths are stronger as they have less camoflage and so they are targeted more by predators. Weaker individuals are eaten by other monsters so only the really strong ones survive to adulthood.