Answer:
The day is their night and the night is their day, when I shout and they shout back I run away.
What is always on its way but never arrives?
What cleans as it gets dirty only to get clean the more you use it?
What has holes on each side, but can still can hold water?
These are the bumpy parts of your digits
What age most travelers have?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?