Board Thread:Speculation House/@comment-14138255-20141017020106/@comment-24106129-20141020220224

Personally I think that a Grimm gets old which causes accumulation of traits that aided in it's survival, reproduces somehow and the successfull traits that that Grimm acquired from it's age gets passed on to the next generation(this is impossible by realistic standards). Otherwise most of the fodder Grimm with bone growths shown in the series were on the way to being Elder Grim and I find it hard to believe that those intelligent hunters would throw themselves at their opponents. Convienent fodder would be a pretty lame excuse.

Magic would be a boring answer unless they come up with something suprising. I just hope they address the origin of the Grimm and the nature of their "psuedo-evolution".