Hourglass Tree Frog, El Valle, PanamaThese little guys are pretty common in Panama (I also saw them quite a bit in Costa Rica). They are known for being the only vertebrate that can lay their eggs either on land or in the water. With ample shade, they will lay them above water, but with little or no shade they will attach their eggs to submerged vegetation.
Nikon D800 with Nikkor 105mm macro lens, ISO 200, f/25 at 1/60th of a second, two Nikon SB-900 flash units