Mouseferatu
Hero
I'm not sure why people have a problem with this. Hit dice and hit points are not just a factor of size--nor should they be.
Why is it so hard to believe that a race of creatures is simply naturally tougher than humans? Perhaps they feel less pain, and so can take more damage. Perhaps they have better defensive instincts, or more stamina. (Remember, hit points are not just physical damage, but also exhaustion and the ability to turn heavy blows into glancing ones.) Perhaps they see better or have better reflexes, allowing them to hit targets more accurately than an average human (and thus, a better starting BAB).
I don't see the problem at all.
Why is it so hard to believe that a race of creatures is simply naturally tougher than humans? Perhaps they feel less pain, and so can take more damage. Perhaps they have better defensive instincts, or more stamina. (Remember, hit points are not just physical damage, but also exhaustion and the ability to turn heavy blows into glancing ones.) Perhaps they see better or have better reflexes, allowing them to hit targets more accurately than an average human (and thus, a better starting BAB).
I don't see the problem at all.