The anterior horn is the longer--rarely above eighteen inches in length--but it is often broken or rubbed shorter, and in no two individuals is there equality in this respect.

The posterior horn in this species is only a sort of knob; whereas in the "keitloa," or two-horned black rhinoceros, both horns are developed to a nearly equal length.
In the "muchocho" and "kobaoba," the after horns can hardly be said to exist, but the anterior one in both species far exceeds in length those of the borele and keitloa.

In the muchocho it is frequently three feet in length, while the kobaoba is often seen with a horn four feet long, jutting out from the end of its ugly snout--a fearful weapon! The horns of the two last do not curve back, but point forward; and as both these carry their heads low down the long sharp spike is often borne horizontally.

In the form and length of their neck, the set of their ears, and other respects, the black rhinoceroses differ materially from the white ones.

In fact, their habits are quite unlike.