Answer:
The fans of the pied piper's smooth sound who are feared by elephants
It can be in a hat, Or out of the bag. If you see it you'll be smitten, 'Cause it's fluffy like a mitten.
The homes of tiny creatures that collect in corners if you aren't vigilant about dusting.
A pony trots his way through the world on these.
From that which comes within itself, It builds its table on my shelf.
Dark, feathery, and popular in Baltimore and fantasy books.