We are apparently supposed to believe that people used to hunt in undifferentiated packs.
As if a typical hunting party might have included a 20 year old man, a 60 year old woman, two five year old boys and a pregnant woman.
And then, one special day, some guy came up with the concept of a hunting party composed only of younger but postpubescent men.
Preposterous.
Just keep in mind that unless you have division of labor, you can't have Marxism or Feminism, defined as one gender or class abusing another. So it's really important.