The term 'water beetle' is a common name for any of the aquatic beetles belonging to the family Gyrinidae. These beetles are known for their WHIRLIGIG behavior, which is why the crossword solution for this term is 'WHIRLIGIG'. WHIRLIGIG beetles have two sets of eyes, one set on the top of their head and one set on the bottom, allowing them to see both above and below the water's surface. They are also able to swim in circles, hence the name 'WHIRLIGIG'.