"What am I?" Riddles

First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?

All day long it's in and out. I discharge loads from my shaft. Both men and women go down on me. What am I?

When you do not know what I am, then I am something. But when you know what I am, then I am nothing. What am I?

Weight in my belly, trees on my back. Nails in my ribs, feet I do lack. What am I?

The shorter I am, the bigger I am.
What am I?

I defend without weapons, stand without legs, wound without force, and I am harder to fight than to kill. What am I?

I love to dance and twist and prance,
I shake my tail, as away I sail,
wingless I fly into the sky.
What am I?

Although I'm far from the point, I'm not a mistake. I fix yours. What am I?

I have four legs, a back, but no head. What am I?

Everyone has me but nobody can lose me.
What am I?

I can be long, or I can be short.
I can be grown, and I can be bought.
I can be painted, or left bare.
I can be round, or square.
What am I?

I warn you about meetings, and I assist you in your life, I can help you do most of your work, unless I have a bug. What am I?

Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?

Take away my first letter and I remain the same. Take away my last letter and I remain unchanged. Remove all my letters and I'm still me. What am I?

Forwards I am heavy, but backwards I am not.
What am I?

When I point up it's bright, but when I point down it's dark. What am I?

I'm where yesterday follows today and tomorrow is in the middle. What am I?

I am seen in the water and in the sky. I am in the rainbow and a jay's feather. What am I?

He has one and a person has two, a citizen has three and a human being has four, a personality has five and an inhabitant of earth has six. What am I?

I can be dropped from the tallest of buildings and survive, but drop me from the smallest ship and I won't. What am I?

I have an eye but cannot see.
I'm faster than any man alive and have no limbs.
What am I?

Guided, I am scraping along, leaving behind my snow-white dust against that which I am scraping, for when I am scraping, I must. What am i?

Lighter than what I'm made of, more of me is hidden than is seen. What am I?

I have eighty-eight keys but cannot open a single door.
What am I?

Travel a mile and I will change, travel a million and I will end as I started. What am I?