Answer:
Hoofed frolicking.
Thirty white horses on a red hill, first they champ, then they stamp, then they stand still.
What kind of nut is empty at the center and has no shell.
All about the house, with his lady he dances, yet he always works, and never romances.
There are millions of me. I am very small but when moving fast I am deadly.
What did the piece of wood say when he saw the screwdriver and screws approaching?