Answer:
From that which comes within itself, It builds its table on my shelf.
I am a mammal that lives in the sea. I have flippers and am known for my intelligence. What am I?
What jumps when it walks & sits when it stand?
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?
I'm the source of all emotion but I'm caged in a white prison.