The Big Five is a term commonly associated with African safaris.
The term refers to the African lion, leopard, rhino, elephant and Cape Buffalo.
It doesn't include the hippo, gorilla or giraffe, nor the cheetah.
The term came about when big game hunters rated the difficulty in taking down large, fierce animals.
(The Cape Buffalo is arguably considered the most dangerous of the Big Five).
Today, the term is used by tour operators when marketing safaris.
Similarly the old-time term of "white hunter" has been replaced by "professional hunter."