A bat-type rodent that can fly. The ideogram of the kalong is usually shown on kites, chair decorations, rickshaws, or on the wall. This ideogram becomes the pride of a young man who feels himself macho, or in Betawi terms buaya darat (playboy). The kalong symbolizes "masculinity" in terms of the buaya darat meaning. The "traditions" of the buaya darat, usually involve living a life without rules until the age of 40. After age 40, a buaya darat usually becomes aware. The kalong is a symbol of the buaya darat because it does not sleep at night.