Northern Green Frog, Muscatatuck National Wildlife Refuge, IndianaA northern green frog takes cover in the duckweed at Muscatatuck National Wildlife Refuge in Indiana. Northern green frogs are commonly sold as pets. I, of course, prefer them in their natural habitat. I took this shot before I owned a macro lens and instead used a close-up filter screwed to the end of my 70-200mm. Nikon D200 with Nikkor 70-200mm lens (at 200mm with Canon 500D close up filter) ISO 200, f/4 at 1/180th of a second.