A rather large creature that likes to eat things.
The Ravenous Bugblatter Beast is so mind-bogglingly
stupid that it thinks that if you can't see it, it can't see you. Therefore, the
best defense against a Bugblatter Beast is to wrap a towel around your
head.
Alas, my great aunt
Susan was devoured by a Ravenous Bugblatter
Beast of Traal. She did not have a towel
handy. And they are very very ravenous beasts.