Answer:
I only exist when you are here. Where you never were I can never be.
I am the signature stroll of ducks and penguins
The 8 of us go forth and back to protect our king from a foes attack
It's been around for millions of years but is never more than a month old. What is it?
I am a person who pretends to be someone else
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?