And it seems appropriate to start at the end, because this is a waste product that comes out of other animals, but it still contains nutrients and there are sufficient nutrients in there for dung beetles basically to make a living, and so dung beetles eat dung, and their larvae are also dung-feeders.
看起来从（别的动物的）排泄开始比较合适 因为便便就是其它动物的排泄废物， 但是它还是有营养成分的 对于蜣螂而言里面的营养成分 已经足够它们维持生命了 所以蜣螂靠吃便便生存， 它们的幼虫也靠吃便便生存。