Here is the 8 querche value (Sc #127) from Ethiopia's June 16, 1919 pictorial definitive series. Stamp depicts the black rhinoceros (Diceros bicornis, also known as the hooked-lip rhinoceros. Although the black rhino is native to eastern and Southern Africa, it is not native to Ethiopia.
Two of the values from Zimbabwe's October 10, 1989 "Endangered Species" set of six feature horned animals. The 15 c stamp (Sc #594) depicts a black rhinoceros (Diceros bicornis) adult and juvenile, and the 45c value (Sc #599) depicts a pair of roan antelopes (Hippotragus equinus).