Disc Winged Bat, Corcovado National Park, Costa Rica
These small bats sleep inside rolled up leaves during the day. They have suction cup like discs at the base of their thumbs and on the soles of their feet that allow them to cling to smooth surfaces. This poor guy was a bit alarmed when he saw my macro lens pointed at him while he was trying to get a little rest.
Nikon D800 with Nikkor 105 macro lens, ISO 3200, f/8 at 1/30th of a second, Nikon pop up flash set to fill mode