Anonymous Americas - Riddle

A moth, I thogh, munching a word.
How marvellously weird! a worm
Digesting a mans sayings -
A sneakthief nibbling in the shadows
At the shape of a poet`s thunderous phrases -
How unutterably strange!
And the pilfering parasite none the wiser
For the words he has swallowed.

Anonymous Americas

http://www.poemhunter.com/poem/riddle-3/