" I commend you on your skepticism, but even the skeptical mind must be prepared to accept the unacceptable when there is no alternative. If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidæ on our hands. "

― Douglas Adams , Dirk Gently's Holistic Detective Agency (Dirk Gently, #1)