User blog comment:StalinGrad6/Earth and Nirn... What if?/@comment-26454274-20150601141757/@comment-5981066-20150602123012

well thats Fallouts fault isnt it? the radiation caused them to not only increase in size but DEvolve back to the state of their ancient furry cousins. Skyrims climate allows a proper adaptation for the fur.

simply put. they mutated. got sick of it. moved to a colder climate. got a fur coat :P