Answer:
What lives where it cannot breathe and has a hole in its back
What is it that has a power socket on one end and a corkscrew on the other?
Known for their natural tuxedos and marching.
What jumps when it walks and sits when it stands?
I am known for my beautiful mane and people ride on my back. What am I?
You use it between your head and your toes, the more it works the thinner it grows.