Heads of Rhinoceroses (Andersson accepted four species, but in modern terms the upper two are 'whites' and the lower two 'blacks'); illustration from p.372 of the 1861 book Lake Ngami.
Date 1861
Source https://archive.org/details/lakengamiorexplo01ande
Author Charles John Andersson
Source: https://commons.wikimedia.org/wiki/File:Lake_Ngami-p371.png

* Square-lipped rhinoceros (Ceratotherium simum)
The white rhinoceros, white rhino or square-lipped rhinoceros (Ceratotherium simum) is the largest extant species of rhinoceros. It has a wide mouth used for grazing and is the most social of all rhino species. An alternative name for the white rhinoceros, more accurate but rarely used, is the square-lipped rhinoceros. Order: Perissodactyla > Family: Rhinocerotidae > Genus: Ceratotherium > Species: Ceratotherium simum

* Hook-lipped rhinoceros (Diceros bicornis)
The black rhinoceros, black rhino or hook-lipped rhinoceros (Diceros bicornis) is a species of rhinoceros, native to eastern and southern Africa. Although the species is referred to as black, its colours vary from brown to grey. It is the only extant species of the genus Diceros. Order: Perissodactyla > Family: Rhinocerotidae > Genus: Diceros > Species: Diceros bicornis