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Robin Moore

Variable harlequin frogs are critically endangered, decimated by the chrytid fungus. Amphibians are considered indicator species because they’re highly sensitive to change in their environments. By monitoring them, scientists can learn about changes in the health of entire ecosystems.

Photo Ark EDGE fellows – including Marina Rivero, second from left – part of a joint project between the National Geographic Society and ZSL, hold Photo Ark images, indicating the species whose conservation they are researching; Costa Rica, 2018. The fate of ZSL will have impact on many conservation projects around the world.

Many amphibian species, including hourglass tree frogs such as the one pictured here in Costa Rica, lack robust population data, making it difficult to determine how much its population has declined.

For many frogs, the ultimate romantic gesture is a long hug known as amplexus. Shown here are red-eyed tree frogs, Agalychnis calidryas, in Costa Rica.

White rhinos stand in front of Mount Kenya under an early morning cover of mist.

In this image taken using an infrared filter, a visitor takes a picture of the Lincoln Memorial from the edge of the Reflecting Pool in Washington, D.C. (This photo was submitted to Your Shot.) Photo Tip: When using an infrared filter, long exposure times and a tripod are needed, and focusing will be difficult. You never know how an infrared image will come out, so be ready to experiment. Buy National Geographic Complete Photography»