Humor can be a more effective way to get a message across than straightforward text. The image to the left, an appeal for the preservation of animals in Rio de Janeiro, is excellent in many regards. The leopard is eye-catching. It is muscular and menacing. The text to the left, "animals are friends, not food", is both the punch line (Who is eating whom? Can we be cuddly friends?) and poignant. The cat needs our help, if not from literal consumption, then from our voracious destruction of its (and our) home.