Answer:
As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.
I hide but my head is outside.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
What did the piece of wood say when he saw the screwdriver and screws approaching?