So in these early mammals, because only mammals have a neocortex, rodent-like creatures. It was the size of a postage stamp and just as thin, and was a thin covering around their walnut-sized brain,
La mamiferele primitive, fiindcă numai mamiferele au neocortex, un fel de rozătoare, neocortexul era mic cît un timbru și la fel de subțire și acoperea ca un strat subțire creierul lor mic cît o nucă.