The International Code of Zoological Nomenclature and classification of domestic animals as species, subspecies, races or breeds has been discussed controversially for many years and was inconsistent between authors.

[1] Assessors of the Food and Agriculture Organization consider domestic water buffalo populations as breeds.

[2] Bubalus species comprise the domestic water buffalo (B. bubalis), the wild water buffalo (B. arnee), the tamaraw (B. mindorensis), the lowland anoa (B. depressicornis), and the mountain anoa (B.

[4] Smith described Bubalus as low in proportion to the bulk with very solid limbs, a small dewlap and a long, slender tail; the head is large with a strong convex-shaped narrow forehead, large eyes and funnel-shaped ears; horns are lying flat or bending laterally with a certain direction to the rear; the female udder has four mammae.

[5] Lydekker added that the line of back is nearly straight with 13 pairs of ribs; the tail is tufted and reaching about to the hocks; the horns are more or less markedly triangular for the greater part of their length and situated low down on the skull; the muzzle is broad, and the hair sparse in adults.