So there's no such thing as a mudshark?

All while I was listening to the really good reading of a very funny, quick book from Gary Paulsen, Mudshark, I thought that a mudshark was a real shark!  It isn't.  I am sad.  I think I would like to see one!  Lyle got his name Mudshark because of his speed, physically and mentally, while playing mudball and while solving puzzles and his friends' problems.  He's a likable, very cool guy.  He has a couple mysteries to solve in his fast-paced and very witty story, including missing erasers and a possible psychic parrot in the school library.  The school librarian is pretty hilarious, as is the principal.  The janitor is a neat character.  There is seriousness and silliness.  I am really loving GP!