By far the most productive nights for photographing frogs and toads tend to be those which are humid, rainy, or drizzly. Above is a recent Green Frog photographed with its vocal sac inflated that was created on a wet evening after the rain stopped. Using a Nikon D800 and a Nikon 105mm Micro lens, I knelt down in the shallow pond with my chest waders on and assumed a low and steady perspective by resting my elbows on the pond’s substrate. Green Frog’s vocal sacs are only inflated for a brief period while they are making their loose banjo string-like song, but closely watching their movements you can easily learn when to press the shutter to capture a fully inflated vocal sac.
Please click on the image to see the larger, sharper version.