Hay's a generic term for grass or legumes that've been cut, dried, and stored for use as animal feed, particularly for grazing animals like cattle, horses, goats, and sheep. Hay can also be fed to pets such as guinea pigs and rabbits, though they consume much smaller quantities. Pigs may be fed hay, but they don't digest it very efficiently. Hay's fed when or where there isn't enough pasture or rangeland on which to graze an animal, when grazing's unavailable due to weather - such as during the… (More on Hay)