Even with such teeth, plant mater is difficult to digest and their backwards pointing pubis gave ornithischians the extra belly room that they needed for a large digestive tract.

即使有这样的牙齿，植物材料也难以消化，它们向后指向的耻骨为鸟臀目动物提供了更大的消化道所需的额外腹部空间。