And so valuable resources have to be looked after and guarded in a particular way, and we think the reason they roll the balls away is because of this, because of the competition that is involved in getting hold of that dung.
貴重な食糧源は特別な方法で 守る必要があります だからフンを遠くに 転がすのではないでしょうか? フン獲得の競争が 激しいからです