Alaska Trip 2005 - jfriend
You will notice that the tree that the Eagle's nest is in is a dead tree.  It didn't use to be a dead tree.  This is what a beaver has done to the base of the tree and that has killed it.  Apparently, the beavers cut down these large trees so they will fall down and can then be a food source for the beavers in the winter (they eat the wood of the tree).  They specifically pick trees that will fall into the river so they can feed on the tree under the surface ice on the river.

You will notice that the tree that the Eagle's nest is in is a dead tree. It didn't use to be a dead tree. This is what a beaver has done to the base of the tree and that has killed it. Apparently, the beavers cut down these large trees so they will fall down and can then be a food source for the beavers in the winter (they eat the wood of the tree). They specifically pick trees that will fall into the river so they can feed on the tree under the surface ice on the river.

Alaska