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They were hunter-gatherers, though unlike wolves, their lack of natural weaponry was offset by their increased brain function and rare status as not only tool users, but the first complex tool makers. For the proto-humans, the voice was a critical tool just as it is for the wolf.When the pack hunts, the members spread out across territory in search of prey.

for which all vocal species seem to have expression, second back off or I will hurt you, and third come here.

That third item is at a higher level of brain function in the concept of drawing friendly forces together for some reason.

It requires not just a condition, but a purpose intended to be addressed by the actions of others.

After the hunt, some scholars, looking to present-day simians, believe that triumphant vocalization was utilized to celebrate success.

The society of these first ancestors was one of pack animals bound together for mutual benefit and protection under the leadership of an alpha male.