The Ravenous Bugblatter Beast of Traal is a fictional creature from Douglas Adams' science fiction series The Hitchhiker's Guide to the Galaxy. It’s famously known as one of the universe’s most dangerous and dim-witted predators. The Beast originates from the planet Traal and is described as being so stupid that it assumes if you can’t see it, it can’t see you—making the best defense against it simply wrapping a towel around your head.