We have several large trees that are growing near the river just in front of the house we are building. They all lean out over the river so that they do not have to compete for sunshine with the trees further inland. One such tree lost its top many years ago and the 30-foot tall remaining trunk base has turned into a mecca for all manner of birdlife. Sometime during the last week, the rotted roots gave out and the trunk fell towards the river only to become wedged in between two living trees. For the moment, it does not appear to be a danger to anyone on land or water so we will not intervene. It is like having a bird feeder that you never have to put food in.