Insects crawl underneath a tree bark and eat at the sap. the tree will eventually die. now resting on the forest floor more insects eat away of the sap and leave the fallen tree bare.
I took this picture yesterday and this is how my hubby explained what happened to the tree.
so interesting - and a great reminder why we need forests as they are a huge ecosystem providing so much to so many. that fallen tree will now host life to so much there on the ground too