Here is some video from a drone we used to inspect a roof for squirrel entry points, in Arnold California, December 2016. The drone made a difficult job much easier.
A squirrel was entering a house from a high and difficult-to-reach location, as you an see in these photos. It took quite some time to find this entry point.
In addition, structural damage from rot, woodpeckers, and the squirrel was severely impacting a structural support beam way up there. Photos by Jason Mink, 14 December 2016.
A leaf-footed bug. Photo by Paul Cooper, Murphys California, 5 December 2016.