A fertile mulch rich in organisms is made from the leaves that have fallen from the top of the tree and have been moistened by rain water. With birds dropping seeds they have carried from elsewhere or depositing fruit seeds with their feces, other trees have found room to grow piggyback on this big old tree.
由於累積了許多從樹冠上掉下的樹葉與雨水，富含有機質，加上鳥兒不斷帶進在外收集到的種子，或在外吃飽了其他果實，來到樹上排便，留下種粒，另一棵樹的生命就此在老樹上展開。