To get things started... Shortly after arriving this year at the FCRE I had a short walk around the ecology center to look at what's new and all that kinda stuff one does after being away for a year. And while looking at this one small palm tree outside one of the dorm rooms I saw two faces staring back at me. A quick photograph allowed me to identify them as tent-making bats (Uroderma bilobatum). These bats chew the ribs of plant leaves to sorta droop them over into a tent. There are hundreds of these tents on the property at any given time, and on several different species of plants, but here they just cut a little parallel line beside the main rib and it was hard to even notice that the leave had been modified.
Visible, but hard to notice, is a white line that starts near the nape of the neck and goes down the back. Beautiful bats.