Answer:
Until I am measured I am not known, Yet how you miss me when I have flown.
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
An iron horse with a flaxen tail. The faster the horse runs, the shorter his tail becomes.
When they are caught, they are thrown away. When they escape, you itch all day.
I grow for a surface, even if you cut me. I continue to grow even after death.
Often cooked as fillet, this meat comes from an animal that swims underwater.