The peanut grows underground – originally only in the Andes of South America, but now in various tropical and subtropical regions. The oldest finds of domesticated peanuts come from Peru and suggest a cultivation history of at least 7,600 years. The popular nut is often roasted, salted or processed into oil. Peanut oil is particularly in great demand in China and India, the two largest peanut producers. The by-product of the oil pressing is a press cake, which is an ideal animal feed.