Game hunters in Africa originally coined the phrase "Big Five" to describe the five animals deemed hardest and most dangerous to hunt on foot: the elephant, lion, rhinoceros, leopard and buffalo. Because of their size, aggression, intelligence and speed, these animals were trophies that came with significant risk, and were therefore prized above all others. Safari operators now use that same phrase to describe the animals they know their clients hope to "shoot" with their cameras.