The mothers did not call for them by name, because that was an invention we had not yet made.

All were nameless.

The mothers uttered querulous, anxious cries, which were recognized by the young ones.

Thus, had my mother been there calling to me, I should have recognized her voice amongst the voices of a thousand mothers, and in the same way would she have recognized mine amongst a thousand.
This calling back and forth continued for some time, but they were too cautious to come out of their caves and descend to the ground.

Finally one did come.