Sheep (Ovis aries) are quadrupedal; ruminant mammals are typically kept as livestock. Like all ruminants, sheep are members of the order Artiodactyla, the even-toed ungulates. Although the name sheep applies to many species in the genus Ovis, in everyday usage, it almost always refers to Ovis aries. Numbering a little over one billion, domestic sheep are also the most numerous species of sheep. An adult female is a ewe, an intact male as a ram, occasionally a tup, a castrated male as a wether, and a young sheep as a lamb.
 

Meat and Poultry

Meat is animal flesh that is eaten as food. Poultry is domesticated birds kept by humans for the eggs they produce, their meat, their feathers, or sometimes as pets.

Humans are omnivorous and have hunted and killed animals for meat since prehistoric times. The advent of civilization allowed the domestication of animals such as chickens, sheep, pigs, and cattle, and eventually their use in meat production on an industrial scale.