Random Riddle: 3-30-2015 - Common Sense Evaluation

I’m quite a show
And people know;
Spinning threads
For capture of heads.

My limbs are many,
But I may be less than a penny.
One prick of me,
And in pain you will be.

I may fly and float as a baby,
And I swing when I’m older, maybe.
I can live in dark,
And have homes of bark.

I peel and fight,
Some people eat me in a bite.

What am I?

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