If he hunted buffalo in Botswana, or anywhere else in Africa, he hunted Cape buffalo (Syncerus caffer). "Water buffalo" refers to a wild (Bubalus amee) or domesticated (Bubalus bubalus) animal from South and Southeast Asia.
A lot of people make this mistake, but if you're going to hunt and kill an animal, at least have the decency and respect to call it by its proper name.
(For what it's worth - the only African land mammal more impressive than a Cape buffalo is an elephant. They have a swagger that comes not from outward aggression, but from the knowledge that they can easily rub you out if you piss them off. Lions generally don't mess with them. They personify the notion of being comfortable with one's own abilities. Here's what I think is the best photo I've taken of one.)
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