Every night at twilight, in a cave just outside the city, the bats start to stir.
It starts with subtle squeaks in the wind, soft and faint. For over an hour the chatter increases, as the bats wake from the day to fly into the night.
Suddenly, small specks start to appear, fluttering quickly, hardly detected.
Then, it is followed by a steady stream, an unimaginable number, for an unbelievable amount of time.
A black ribbon of twisting and turning bats burst from the cave, flying forward together into the night.