In reply to:

20,000 Leagues Under the Sea, Jules Verne

I agree. Did you know that this book features a description of a giant squid, complete with beak, and was published before giant squids were known to the scientific community? (They were probably known anecdotally by sailors.) The bodies of giant squids were subsequently discovered and were found to indeed have huge, powerful beaks. As far as I know, to this day no one has ever captured a living giant squid.