The oat (Avena sativa), a member of the grass family, is one of the most widely cultivated plants on earth, being used as a food crop, as livestock feed, and as an ingredient in cosmetics (especially lotions and soaps). Oats are nutrient-rich and provide more protein and fat than other grains. The plant is best grown in temperate climates with cool, wet summers, so the leading oat producers include Russia, Canada, and Spain.