Answer:
Long and slinky like a trout, never sings till it's guts come out.
My teeth are sharp, my back is straight, to cut things up it is my fate.
I am so simple that I can only point. Yet I guide men all over the world.
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
In the land of the green glass door there are riddles but no answers, sheets but no blankets, and books but no words. Name something found in the land of the green glass door.
Dark, feathery, and popular in Baltimore and fantasy books.