Gray Treefrog

This is either a gray treefrog (Hyla versicolor) or a Cope's gray treefrog (Hyla chrysoscelis). Both are found in Ohio and they can't really be told apart in the field except by their call. Both exhibit a wide range of colors and can change colors to match their backgrounds. I've seen gray treefrogs live on lights for an entire summer. They must snap up moths that are attracted to the lights at night. See http://www.ohioamphibians.com/frogs/frogspecies.html for more information.