Answer:
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
I row quickly with four oars but never comes out from under my own roof.
I spend the day at the window go to the table for meals and hide at night.
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen. What am I?
Dark, feathery, and popular in Baltimore and fantasy books.