Most Asian Water Buffalo are domesticated and have been for hundreds of years, so have their own species -- Bubalus bubalis (below) -- but some of their wild cousins remain in northeast India and southeast Asia and are given a separate species Bubalus arnee or a subspecies Bubalus bubalis arnee (above). The wild African/Cape Buffalo is a different genus.
The wild Water Buffalo (above) look similar to the domestic (below) but are significantly larger, the second or third largest wild cattle after the Asian Gaur and, possibly, the wild Yak, and about a third larger than their domestic counterparts (below) at some 6 foot shoulder height. They also have white socks like the wild Gaur and Banteng.
Both male and female Water Buffalo have large horns. They love being half-submerged in water on a hot day.