Answer:
What has armor but is not a knight, snaps but is not a twig, and is always at home even on the move?
I'm a red creature from the sea with large claws, or pincers, and I'm often boiled and served as an expensive dish at seafood restaurants.
Dark, feathery, and popular in Baltimore and fantasy books.
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
A king without a crown
The more of me you take, the more I appear behind you. What am I?