I am also working on figuring out which bats live where in the cave. In a big cave with very high ceilings, the way to do this is to spend a lot of time in the cave under the roosts and wait for a dead or dying bat to fall to the floor. Yes, where there is life there is death, and here it provides us an easy way to know what's up there.
So a few photos from my trip to the cave today, where I was happily wandering around solo with my lights, big flash and camera, and a ton of gear in my pack (it weighs about 20 pounds for this type of work).
We arrived at the visitor center and unlike a lot of cave trips, already had all our things ready to go. However, there was very nice bird sitting on a lamppost in the parking lot so it got some attention.