I too question how the plains indians avoided rabbit starvation. But then again, they knew to kill the oldest fattest buffalo, and they ate the brains, eyes, marrow, tongue, spinal fluids, kidney and heart fat, hide fat, back fat, and any other source of fatty substance inside the animal. I also bet that they also dug holes in the ground and burried slabs of fat/meat for the winter months, as animals do with their excesses.