Ladybird beetles, ladybugs, are insects usually 0.4 inches (10 mm) or less in length. They are oval or nearly circular, highly curved above and flat below. Although some ladybugs are without markings, most are brightly colored. Both adults and larvae are voracious eaters of aphids, scale insects, and other plant pests. Two species of ladybugs are plant-eaters, and the others are extremely beneficial. They serve to rid gardens of pests, while serving as a fascination to children.