The pig (Sus domesticus), also called swine (pl.: swine) or hog, is an omnivorous, domesticated, even-toed, hoofed mammal. It is named the domestic pig when distinguishing it from other members of the genus Sus. It is considered a subspecies of Sus scrofa (the wild boar or Eurasian boar) by some authorities, but as a distinct species by others. Pigs were domesticated in the Neolithic, both in East Asia and in the Near East. When domesticated pigs arrived in Europe, they extensively interbred with wild boar but retained their domesticated features.

A few other species of maple are also sometimes used as sources of sap for producing maple sugar, including the box elder (or Manitoba maple, A. negundo),^[5] the silver maple (A. saccharinum),^[6] and the bigleaf maple (A. macrophyllum).^[7] Similar sugars may also be produced from birch or palm trees, among other sources.^[8][9]