Derelict man made and animal made

Today we visited the rests of the silos that were torn down this week (see the journal of Hanulli). I thought it too clear an example of dereliction not to share. The first extra shows that the silos were not maintained well, moss freely growing on it.
But earlier I saw great signs of derelict nature, animal made. Since some years we beavers trying to settle in and around our rivulet. They have some natural enemies, with big tractors, but enough friends too.
Nobody in our village saw one of the beavers, but we see fresh tracks. Powerful teeth bite our trees in pieces.