Whirligig
n.
Any one of numerous species of beetles belonging to
Gyrinus and allied genera. The body is firm, oval or boatlike in form,
and usually dark colored with a bronzelike luster. These beetles live
mostly on the surface of water, and move about with great celerity in a
gyrating, or circular, manner, but they are also able to dive and swim
rapidly. The larva is aquatic. Called also weaver, whirlwig, and
whirlwig beetle.