> ---------------> It was a time of a mixed organization for Humans
> a) the territory of a single Human Family was preserved and remained large
> b) but the Humans Families needed to meet together, from time to time, finally in order to can survive --> this means --> in order to succeed in some delicate operations:
> - hunting (maybe the humans became hunters only at this moment too: remember one FOXP2 mutation is shared with the Carnivores) and
> - to can defend together against different natural enemies.
A VOCAL-LEARNING SYSTEM COULD APPEAR
-------------------------------------
--> IN THE TRANSITION PERIOD: FROM A FAMILY GROUP TO A LARGER LIVING GROUP
--> IN A SITUATION, WHERE THE FAMILIES ARE STILL SEPARATED ONE FROM THE OTHERS, BY RELATIVELY BIG DISTANCES
--> BUT THEY NEED TO REUNITE IN LARGER-LIVING-GROUPS FROM TIME-TO-TIME DUE TO A STRONG SURIVAL PRESSURE (predators, foods)
--> AND THEN, THEY SEPARATE AGAIN, COMING BACK INSIDE THEIR FAMILY AREAL
PLEASE READ THE COST AND BENEFITS OF LARGER-LEAVING-GROUPS
-----------------------------------------------------------
http://books.google.co.uk/books?id=W-UQNoxMONwC&pg=PA199&dq=Cetacean+societies:+Group+Living+Connor#v=onepage&q=Cetacean%20societies%3A%20Group%20Living%20Connor&f=false