The principal adventure-related features of some of these tours may be outlined as below. At a global scale, the most famous examples of large and potentially dangerous animals used as tourist attracts must surely be the Big Five of east and southern Africa. Though this term has now long since entered the lexicon of tourism marketing, it was originally used by big game hunters to refer to the five Africa animals which were the most dangerous to hunt. These are: elephant, rhino, buffalo, lion, and leopard. These species, however, are by no means the only large and potentially dangerous animals to be seen in the African savannahs. Most of the larger herbivores have potentially lethal hooves and horns, even though they do not often use them against humans. Hippo and crocodile are also responsible for a number of deaths ever year; and for those sleeping outdoors, precautions against potential hyena attacks are necessarily routine.