sentences:  These bales can be placed in stable stacks or in large feeders for herds of horses or unrolled on the ground for large herds of cattle.The bales can be loaded and stacked with a tractor using a spike, known as a bale spear, that pierces the center of the bale, or they can be handled with a grapple (claw) on the tractor's front-end loader.A more recent innovation is large "square" bales, roughly the same proportions as the small squares, but much larger.