Your pictures are great, very nice indeed!
One of the coolest things I ever saw was the Mexican free-tail bats under the Congress Avenue bridge in Austin. It was simply amazing to watch them all come out, and out, and out!
My son is going to school for Wildlife Management and spent the summer trapping all sorts of bats for research, I'll have to post some of the pictures he sent me. They got some pretty nice shots of angry little bat faces