The green pastures and idyllic barnyard scenes of years past are now distant memories. On today's factory farms, animals are crammed by the thousands into filthy windowless sheds, wire cages, gestation crates, and other confinement systems. These animals will never raise families, root in the soil, build nests, or do anything else that is natural and important to them. They won't even get to feel the warmth of the sun on their backs or breathe fresh air until the day they are loaded onto trucks bound for slaughter.