In this photo released by the Wildlife Conservation Society, a blue poison dart frog is perched on a rock at the Bronx Zoo, Tuesday, Sept. 9, 2008 in New York. The frog's blue color serves and an indicator for other species that its secretions are toxic

                                                  

July 18, 2008
Hauling herself across the sand, a leatherback turtle makes her way out of the ocean to nest on Matura Beach in Trinidad.

Photographer Brian Skerry describes how he made this image: "This picture was made at about 2:00 AM under a nearly full moon.  I did a long exposure and used a tiny bit of flash for fill light. But I set the flash  on 1/16th power and gelled it (covered it with a filter) to reduce the output even further. Leatherbacks are affected by white light and even though the scientist I was working with told me I could use all the flash I wanted, I resisted and shot the turtles with a low flash only during moonlight."

Photograph by Brian Skerry
Photo Date: May 8, 2007