So i was thinking about why does whatever causes mutations in the Fallout universes makes small beings bigger but big beings not. And a member of the vault said this would make an interesting discussion.
So why are the muties in Fallout the way they are. Why (from an evolutionairy standpoint) is it good for scorpions to grow big? Why to Brahmin have two heads? Why can fire ants spit fire?! And why are Cazadores general A**holes?
So why do you think certain animals in the wastelands have evolved a certain way?