Woolly Warthog

The woolly warthog (Phacochoerus atlasii) is an extinct species of warthog that lived in what is now the Atlas Mountains during the last Ice Age from 150,000 to around 10,000 years ago. Unlike modern warthogs, the woolly warthog was covered in thick fur that was orange-brown in color, like a cross between fur colors of a modern bush pig and a Red River hog, with tufts of hair coming from each side of its head. Its genomes were researched by scientists and the animal is proved to have been more closely related to bush pigs than modern warthogs, suggesting that this animal diverged from the ancestors of bush pigs and "more advanced" warthogs half a million years ago. It was likely an omnivore that fed on the same type of food as modern bush pigs and warthogs. It is unknown why these pigs went extinct, but it may have been due to climate changes from the last Ice Age ending, human overhunting, or both.

De-Extinction
However, extinction isn't forever, since there's enough preserved DNA for scientists to try to bring this extinct warthog back from extinction, using the bush pig as a surrogate mother, since the bush pig is the closest living relative to woolly warthogs.