Rarity, here at WK is calculated in several ways.  We have tried to blend set trait points with the true rarity of % points and even on some a % point with a bonus for being a extremely low number with in the % point.  Trying to make it as clear as possible what an animals trait count is at that very moment.  Moment being the key word, as new Breeds are introduced or new Species for that matter your trait points will be higher as there are very few out there. As more are produced the numbers will shuffle and some will fall. This is more noticeable in the beginning and levels off rapidly so it doesn’t change as much once the breed/species is established.