However, it's important to note that "Ng'ombe" also means "cow" in Kikuyu. To be more specific, you could use the term "Ng'ombe-ng'endu" which literally translates to "black cow", and is sometimes used to refer to the rhinoceros.
If you want to be even more precise, you can use the specific name for the rhinoceros species in Kikuyu:
* "Ng'ombe ya pembe mbili" (two-horned cow) for the white rhinoceros
* "Ng'ombe ya pembe moja" (one-horned cow) for the black rhinoceros
Keep in mind that these terms might not be universally understood by all Kikuyu speakers, as the language is diverse and has regional variations.