Common warthog Phacochoerus africanus are the smallest of the diurnal bare-skinned large mammals (adult males ≈ 80 kg; adult females ≈ 56 kg). Partly due to their sparse cover of hair and low body fat, they are intolerant of cold and hot air temperatures.
There are two species of warthog, the well-known common warthog Phacochoerus africanus and the desert warthog Phacochoerus aethiopicus. The latter occupies the Horn of Africa and Kenya but it once occurred in South Africa and, perhaps, Namibia, where it was known as the ‘Cape warthog’. The desert warthog, long overlooked by zoologists, is one of Africa’s least studied and most poorly-known large mammals. Although this pig was described in 1766, confusion concerning its taxonomy resulted in the recognition of only one species of warthog, the common warthog.
By Yvonne de Jong & Tom Butynski, Eastern Africa Primate Diversity and Conservation Program & Lolldaiga Hills Research Programme
Mount Kenya potto Perodicticus ibeanus stockleyi Butynski & De Jong, 2007 is only known from one specimen, collected in 1938 at 1,830 meters above sea level on Mount Kenya, central Kenya. This subspecies has not been observed alive for 79 years and is, thus, considered to be both a ‘Critically Endangered’ subspecies (Butynski & De Jong, 2017a) and ‘lost’ subspecies.