Answer:
I'm an animal. I love marching. I always wear a tuxedo. What am I?
What runs but never walks has a mouth but never talks has a head but never weeps has a bed but never sleeps?
This guy crossed a road and everyone wants an explanation.
I am the word that is always spelled correctly by everyone.
Weight in my belly trees on my back nails in my ribs feet I do lack.
No matter how little or how much you use me, you change me every month.