" When you are alone, you have all the time in the world to practice whistling like a bird. When there is no one in the world you can turn to, a horse or .even a lion may give you companionship. When you don't know if there is anyone in the world like you, you seek contact with something living however you can "

― Jean M. Auel , The Clan of the Cave Bear, the Valley of Horses, the Mammoth Hunters, the Plains of Passage (Earth's Children, #1-4)