Squigly Squigly's Brain Teasers

Question:

I have four wings, but cannot fly,
I never laugh and never cry;
On the same spot I'm always found,
toiling away with little sound.
What am I?

Answer:

A windmill.

Try another Brain Teaser:

30 white horses upon a red hill,
first they start stamping,
then they stand still.

What are the 30 white horses?