Answer:
I'm a mammal that can fly and I sleep hanging upside down. What am I?
From that which comes within itself, It builds its table on my shelf.
While I did live, I food did give, which many one did daily eat. Now being dead, you see they tread me under feet about the street.
I quack and have webbed feet. What am I?
The strangest creature you'll ever find: Two eyes in front and many more behind.
You use it between your head and your toes, the more it works the thinner it grows.