Somewhere in a dark cave, amongst a million hungry and dehydrated baby bats, a scarred infant intently listens . Amidst a million high pitched squeals it senses a change , the approaching rush of wings, millions of parent bats returning , finally .
And there ,crystal clear and without a doubt , a shriek so emphatically familiar , the infant responds with its call, the bond is made amongst millions and there is , survival.
Someday we will understand how they tell apart . Today we just know they do.
If they do not , they die !
Enjoy the music.