But because H. heidelbergensis had a larger brain-case - with a typical cranial volume of 1100-1400 cm ³ overlapping the 1350 cm ³ average of modern humans - and had more advanced tools and behavior , it has been given a separate species classification .
Because H. heidelbergensis had a larger brain-case - with a typical cranial volume of 1100-1400 cm ³ overlapping the 1350 cm ³ average of modern humans - and had more advanced tools and behavior , it has been given a separate species classification .