There are several species of pig in the world, but the most well-known and widely domesticated is the domestic pig (Sus scrofa domesticus), which is believed to have been domesticated from wild boars in several parts of the world, including Asia and Europe. Other species of pig include the wild boar (Sus scrofa), which is the ancestor of the domestic pig, and several species of wild pig found in Asia and Africa, such as the warthog and the babirusa. There are also several breeds of domestic pig, each with their own characteristics and traits.