BIG BROWN BAT (Eptesicus fuscus)

2015-4-28 Newark, DE --*Sarah B. Deutsch and her boss at the DNREC corrected my ID.*--
The Bat, the only mammal capable of true flight.
--- I thought it was ill because it was on its back, flapped its wings, and kept tucking its head (backwards) down toward the ground. Once in hand, I believed I might have been adding to its discomfort by always turning it back over on its stomach so I didn't take too much time and hurried the pictures. It wasn't aggressive at all and, except for repeatedly turning itself over, seemed calm.
---After pictures were finished, I took it to a shaded bush and placed it inside, hoping the Red-tailed or daily patrolling Cooper's wouldn't spot it. When I checked on it later in the evening, it was gone. I hope it flew away.
---Since Bats only eat bugs, and this one was definitely chewing the clover leaves, I wonder, perhaps, if it wasn't actually eating the leaves, might it have been just chewing on them for liquid.(?) Maybe it was thirsty/dehydrated. It was a sunny and warm day and this took place sometime in the afternoon, in the heat of the day. One of the pictures shows some green "stuff" at the corner of its mouth, which is another reason I thought it was eating the leaves.
---The only reason I can spin for the incessant flapping of wings is, perhaps, because if it's used to flying while feeding, it might be instinctually repeating that behavior even though it's dining on clover, not flies, and doing it on the ground, instead of in the air. That might also explain why it stayed on its back - that's the only way it could flap its wings, and, I imagine, that position (head back and down) would protect its eyes more from the sun, too. Makes perfect sense to me! :o) (I do like spinning castles in the air.)
---Initially I thought this might be the Little Brown Myotis, but later research and the ID from the two folks at DNREC cured me of that idea. :o)
-5/20/15 - One final note, the folks at the DNREC didn't speculate about nor offer any information on why it was on its back, why the baculum was larger than in other pictures I found of male Bats, or why it was chewing on clover leaves. Perhaps that would be conjecture. and scientists don't do that. That leaves me with my own concocted fables and, until I hear or find another explanation, I suppose it's as good as any other. It may not be scientific but it satisfies my curiosity somewhat. Stating that I'm guessing about that behavior, I suppose, is as close to being scientific as I can get.
---If you want to know what the ID process is often like for me, enlarge the last picture in this series and you'll find some of my notes and comments in the description of that picture.
-5/28/15 - more notes on the behavior, thanks to leads from Andrea at Tri-State Bird Rescue, can also be found under the last picture. Now the only question I have left is why the baculum is so much bigger than the ones I've seen in other pictures of the Big Brown Bat. I suspect that also has something to do with its seemingly disabled state.