I think I saw a big brown bat fly by this evening just a few minutes before full dark. I am camped near the Grand Canyon some hillsides and cliff where there would be some recesses. There are some old structures here and there in the area over along the historic Grand Canyon Railroad line. I do not drive out that far as I do not want to stress my vehicle suspension on those rougher forest service roads that are pretty rutted from the 4 wheeler activity. This area has deer hunting in the fall so mud ruts can get pretty deep the further in you go away from the highway.