Tumblebugs in the genus Canthon create two kinds of dung balls: brood balls, to lay eggs in and for their larvae to eat, and food balls, for the adults to consume. Face down, the males roll the balls backward, pushing it along with their hind legs. The female often rides the ball of dung or helps the male to push.
There are about 20 species in this genus in North America north of Mexico, and they can be difficult to tell apart. These beetles are smooth, rounded, and plain black. A few species have an iridescent green sheen. As with other dung beetles, the forelegs are powerful and spined, because these beetles have a lot of hard work to do.
Learn more about tumblebugs and other dung beetles in their group entry.